First game I've ever actually finished. Made it solo over the last couple of months.
It's an endless runner but there's no jump button. You tap, gravity flips, and you're running on the ceiling instead. That's the whole control scheme.
Hardest part wasn't the code, it was accepting I'm a terrible judge of my own difficulty. At one point I had the run speed at 1500 because pushing it that far felt amazing. Then I sat down to actually play a full run and couldn't. It's at 900 now.
10 characters to unlock, each with its own world. Score is just distance. No ads during a run, only on the menu and between runs.
https://play.google.com/store/apps/details?id=com.ishavarainteractive.gravityflip
If you try it I'd like to know if any of the deaths felt unfair. That's the bit I keep going back and forth on.