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