I'd like to get back into coding a bit because I haven't in a good while. What are some project ideas that are about or a little higher than what I can do so I can try to improve?

I feel like these games show the level I'm at well enough: dummy cat, alleyway treasure, and cereals serial cereal shop So please base your ideas off of what you think I can make based on those.

A tile-based RPG or platformer. Or a project that's rendered entirely using stamps.

Number to Binary for non-games. If you want to make a game, then why not recreate Lemmings from the SNES or SimCity?