Write the prompt around a playable rule
The prompt defines a route, a basic defense and a planning window. To introduce a second role, make it solve a distinct problem: a slow cannon can handle a cluster while archers handle single raiders. Keep tower ranges visible so placement can be reasoned about. A first wave should be slow and small enough to observe target selection.
Original concept prompt: “Build a compact island defense game with one winding path to a keep. Tap an empty pad to place an archer tower; archers target the nearest raider. Show the next wave and each tower’s range. Give players a short planning pause before a wave, and make the keep’s remaining health visible throughout the attack.” This is a recipe for an idea, not a claim that this exact game is already playable.
Play, observe and refine one thing at a time
Place a tower near a bend and another near the keep, then compare which raiders each one attacks. Check whether the route and range rings remain readable when effects overlap. If the player loses without understanding why, show incoming enemy types or explain which defenses can stop them. Replay the opening wave after each change to check the lesson still works.
Tune the path, tower range or wave count one at a time. If every placement succeeds, introduce a second route or a tougher enemy after the core defense is understood. If the planning phase feels rushed, extend the pause instead of slowing the entire attack. Explain upgrades by their concrete effect, such as range or damage, and retest whether the player can choose intentionally.
Avoid adding a large technology tree before the first wave feels legible. More defenses are useful only when they create different placement decisions. Keep an early loss recoverable through a restart or a clear retry, and do not imply multiplayer raids or other features unless they are truly part of the generated result.
Playable reference for this prompt: Stone Keep. Build and upgrade walls, archer towers, cannons and gold mines around your island keep, then alternate rounds: hurl catapult stones at landing raiders to defend it, and drop knights on the shore to raid enemy camps for stars and gold. Use this example to compare the proposed rules with a game you can try now.
Questions about tower defense game prompt
What should players know before a wave starts?
Show the incoming threat, the keep health and each tower range. A planning interval lets players make a placement decision before the defense begins.
How many tower types should I request first?
Begin with one reliable tower and one enemy route. Verify targeting and damage before introducing a second tower whose role is clearly different.