As a Warm-Up, Here's Some Ideas

Collapse: Shoot weird stuff at wizard tower to collapse it. Scorched Earth-like maybe?

Rock, Paper, Scissor: Fighting game with 3D characters and cool anims, lots of juice, but ultimately it's just RPS

Alchemy: Make potions, some combinations explose

Strange Creature: open world game, find and pet all creatures

Edge of the World: You're a giant creature who has to balance on a flat earth

Repair: Recettear but it's a repair shop and you have to go to a dungeon to get spare parts

Build your own path: Minecraft-like where you need to build a path over a terrain with crafting

Single Resource: You're a vampire and your blood is both HP and MP (also, my suggestion, yay!)

Momentum: Snake game?

Leave something behind: ... dungeon crawler but after each level you need to leave one item?

Connected: Social deduction game, who knows who, like Murdle

Combinations: Arrange people into teams to solve puzzles

Isolated: Escape room but bigger?

Stronger together: Tile-based strategy game where allies in adjacent spaces give bonuses

Sanctuary: Cross a wasteland that's has areas where you can rest and regain health

Folklore: Card game with different folklore creatures