So not really the theme I hoped for but I have a few idea which I'd love to see if someone else would join in on.

First of a Bullet hell game combined with some clever inventory management, OH YES did I mention this idea have an ass-ton of guns and powers?

Some sort of 3D or 2D parkour game where the space around you is literally running out as a room is getting filled up with random stuff! you must escape with your sick moves!

God simulator: Well this is for those who really wanna be horrible, imagine game play like Plague Inc but you're god which need to kill people with different powers to avoid the earth getting overcrowded/overpopulated and draining the earth's resources completely.

Some sort of game where items is abilities which you use you complete stages.

Some sort of space game where you litterally fly out of space?

Ps. I'm a programmer with 10 years experience and game designer. Hit me up on discord if you wanna make magic together: jacksendary#9565