Indie studio plan
Give design, UI, and QA one shared item definition. Everyone should use the same benefit, duration, Koin price, and ownership rule.
Indie Studio guide · Tower Defense · Direct Koin item
How an Indie Studio Can Add a Koin Convenience Upgrade to a Tower Defense Game
Build the tower defense game first, then add one optional convenience upgrade that supports the existing play loop. This guide keeps the item understandable from its first preview through delivery and reload.
Create this game flow
Plan the convenience upgrade around the game
Why it fits tower defense
A tower defense browser prototype centered on wave planning, tower roles, and upgrade timing.
What the item offers
A convenience upgrade preview with a concrete description and direct Koin price.
A practical tower defense example
Offer moment
Place the convenience upgrade after this loop advances: a tower defense browser prototype centered on wave planning, tower roles, and upgrade timing. Wait for a safe pause. Player progress must not depend on the offer.
Offer card
Offer-card rules: Keep tower roles readable; Show the before-and-after limit. Show the item, benefit, ownership or duration, balance, and specific Koin amount. Keep confirm and cancel separate.
Successful result
Test preview, confirm, insufficient balance, success, apply the durable convenience entitlement and show the changed limit, and reload. Show that change inside normal play instead of relying only on a success message.
Free path
Test a free session around a tower defense browser prototype centered on wave planning, tower roles, and upgrade timing. If play becomes incomplete, fix the game before changing the offer.
Design the convenience upgrade in detail
Use the build phase
Show an offer before a wave or after rewards are counted, never while enemies are moving and towers require attention. The player should be able to inspect the lane and dismiss the choice calmly.
Keep tower roles readable
Preview range, target rules, duration, or visual-only status with the same symbols used in play. Avoid selling an unclear boost that makes wave balance impossible to understand without purchasing it.
Run the next wave twice
Compare the free path and owned state against the same wave. Cancelling the action and reload must preserve placed towers and earned currency, while the delivered item appears only in its promised build or inventory slot.
Use one wave as a repeatable purchase test
This tower defense game uses a tower defense browser prototype centered on wave planning, tower roles, and upgrade timing. Review the genre through use the build phase and keep tower roles readable. For a indie studio, the convenience upgrade should support that loop without becoming mandatory. Review the item through show the before-and-after limit and treat the upgrade as durable. An indie studio can divide timing, interface, implementation, and failure testing among named owners. The example offer is: A convenience upgrade preview with a concrete description and direct Koin price. This offer emphasizes less friction while preserving the playable free path before expanding the catalog. Prepare a map with a fixed tower layout, earned currency, incoming wave, lives, and upgrade choices. Open the item only during the build phase, cancel, and verify that placement and targeting rules remain intact. Try insufficient Koin without starting the wave or consuming game resources. Complete the valid choice, place or equip the delivered result, and run the same wave used by the free version. Compare range symbols, target priorities, visual clarity, and outcome without hiding balance changes. Then restart or reopen at the next build phase and check that towers, rewards, ownership, and Koin reconcile once. The game should not require the item to repair a wave made unfair on purpose.
Give each discipline one decision
Design owns the offer timing and free path, UI owns readable states, engineering owns state transitions, and QA owns failure coverage. Agree on the same item definition before anyone creates implementation tickets.
Review the playable flow together
Use the prototype in a short team session and walk through decline, insufficient Koin, pending, success, delivery, and reopening. Resolve player-facing disagreement in the build instead of leaving it inside separate documents.
Turn states into production tasks
After the journey is approved, split identity, durable ownership, native billing, security, refunds, policy, localization, accessibility, and analytics into explicit work. The prototype should not be treated as proof that those systems exist.
Keep QA independent of the happy path
Have a tester interrupt confirmation, repeat an input, change screens during delivery, and reload at several points. Compare the result with the agreed item promise and reject duplicate grants or unexplained Koin changes.
Turn the review into an owned team decision
Schedule a short session with design, UI, engineering, and QA using the same playable link and item definition. Assign one person to operate while the others record disagreements about timing, wording, delivery, fairness, and recovery. End with an explicit decision for each disputed state and name the owner of every native implementation task. Update the prototype or source brief before tickets spread outdated assumptions. QA should then write independent scenarios from the agreed player promise, including interruption and duplicate input. This creates a shared reference without mistaking the browser build for a backend, billing integration, revenue forecast, or release approval.
Prove the improvement without manufacturing discomfort
Display the current capacity, preset count, queue size, travel option, or workflow limit beside the precise improvement and show whether ownership is permanent. Play a representative session without it and record whether storage, repetition, waiting, or navigation already feels intentionally designed. If the free experience is cramped or slow only to sell relief, repair that baseline first. Complete the choice, apply the new limit in its normal screen, fill or use the added capacity, and reopen the game. The higher limit should remain visible and should never appear buyable again for the same account state. Check that a player cancellation preserves existing configuration, insufficient Koin changes nothing, and the upgrade helps without turning ordinary progression into a penalty.
Show the before-and-after limit
Display the current capacity or workflow and the exact improvement, such as additional inventory slots or another saved preset.
Treat the upgrade as durable
Once the item is bought, apply the new limit visibly and preserve it after reload. Do not make the player buy the same permanent improvement again.
Remove artificial friction
Test the game without the upgrade. If normal play feels deliberately slow, cramped, or repetitive only to sell relief, improve the free experience first.
Build it in five steps
1. Finish the tower defense loop
Make the main activity playable before adding the convenience upgrade. Players need context to judge whether the item is useful.
Result: A working tower defense foundation
2. Write one item definition
A convenience upgrade preview with a concrete description and direct Koin price. Keep the same wording in the preview, confirmation, and delivered state.
Result: A consistent player promise
3. Generate the purchase choice
Show the exact Koin amount, current Koin balance, confirm, cancel, and what ownership means. Design chooses the offer moment, UI makes every state distinct, and QA tests transitions and recovery. Use the playable prototype during the team review.
Result: An understandable decision
4. Deliver and recover
Test preview, confirm, insufficient balance, success, apply the durable convenience entitlement and show the changed limit, and reload. Then test an insufficient balance, cancelling the action, repeated input, interruption, and reload.
Result: A visible, stable result
5. Test as a indie studio
Write test cases for not enough Koin, a player cancellation, delayed delivery, repeated input, and reload. Create production tickets only after the player journey is agreed.
Result: Indie studio plan
Generate it in SEELE
Prompt 1
Create a browser-playable tower defense game prototype for a small indie studio. Build the core loop around wave planning, tower roles, and upgrade timing. Add one optional convenience upgrade offer containing an inventory expansion with before-and-after capacity, Koin price, and persistent owned state. Price it directly in Koin, require an explicit confirmation, show the balance effect, and apply the durable convenience entitlement and show the changed limit. Do not add subscriptions, external payment checkout, revenue reporting, or guaranteed earnings. Include insufficient-Koin, cancel, success, and reload states.
Prompt 2
Keep the item optional. Show its full price in Koin, Koin balance now, confirm, cancel, low-balance, success, visible delivery, and reload states.
Indie Studio playtest checklist
- The convenience upgrade supports the existing tower defense loop.
- The item benefit and ownership rule are clear before the player confirms.
- The precise Koin price and available Koin balance appear together.
- A player cancellation returns to play without loss or pressure.
- Success visibly delivers the confirmed convenience upgrade.
- Write test cases for not enough Koin, a player cancellation, delayed delivery, repeated input, and reload. Create production tickets only after the player journey is agreed.
Before you publish
- Avoid this design problem: turning ordinary play into artificial friction that exists only to sell relief.
- This guide uses a direct Koin transaction for one optional game item. It does not create a subscription or recurring charge.
- The result is a prototype that runs in a browser. Native billing, identity, durable entitlements, security, refunds, and store approval need separate implementation.
- SEELE does not provide payment analytics, tax tools, payout reports, or guaranteed revenue through this flow.
Frequently asked questions
What should this tower defense offer contain?
A convenience upgrade preview with a concrete description and direct Koin price. Start with one item and one price.
Is this a subscription?
No. The player spends Koin directly on one named item or unlock.
What happens if the player cancels?
Return to the same game state without spending Koin or delivering the item.
What if the Koin balance is too low?
Explain the shortage, preserve progress, and do not deliver the item.
Does this include payment or revenue reports?
No. It covers the player-facing purchase experience, not financial reporting.
Is the prototype ready for a native store?
No. The browser prototype still needs native billing, persistence, security, refunds, and platform approval.
Build this tower defense purchase flow
Open the complete prompt in SEELE, adjust the item and Koin price, then generate a playable version you can test.
Open this prompt in Workspace