My visual mockup
Theme:
Cat themed laser defender style game. You play as a cat lady trying to capture all of her cats who escaped the house when she forgot to shut the door one day. The cats are feisty creatures who enjoy their newfound freedom though, and they attack you with cat magic. You’ll have to be quick to catch all of them!
Player Experience:
The game should have a fast paced and silly feel to it. You want to get all of your cats back, but you should never feel like the cats or yourself are getting hurt. To ensure this, the art style and vibe should be cozy and cute, and the visual and audio effects should be chill (projectiles should look more like ~magic~ than bullets, and sound effects should be cute meows rather than angry or in pain meows).
Core Mechanic:
Shoot your magic at the cats to capture them, and avoid being hit by their cat magic.
Game Loop:
Multiple levels with different cats and scenery. Each level is a different part of town that you have to go through to find all of your cats. Each level should get progressively more difficult, with faster movement and more projectiles coming at the player.