Make a scrolling platformer game with RPG stats, a unique character, and a story
Make an RPG where each level up you choose from two upgrades, which each branch into their own set of two upgrades, so 2+2^2+2^3… 8 levels would be a good number, they should all be unique and interesting
Make a maze game that scrolls with a zoomed-in camera so you can get lost, add some enemies that move you around and add some darkness effects