Good use of theme gravity + control. This kind of game need very precise jumping, and sometimes, it's not enough permissive (need coyote jump). It could be interesting that the background  use a logic to identify immediatly caracteristics (use arrow bacground to say gravity up/down, and 2 background colors to say regular/inverted jump, for instance). Though, I like the idea of infinite runner, procedural generation of level. Well done.

I liked the sound effects and concept. The idea of the 4 zones was very unique and cool. The procedural generation was also very good. The music is also nice and i like it a lot. The jump could be improved slightly, but overall I liked the game quite a bit. Well done!

This is pretty fun! I think I've played several "flip the gravity upside down" game submissions, so it's unfair to you that I played yours after those. BUT, your game has one of the best "teaching the player" moments. At least in your game, the controls were shown to me and the levels taught me how to play the game - That's why I played so many runs of your game.

Also, this is an awesome first game.