I like switching the gravity. 

The game needs quite a bit of polish. The pixel art is blurry and the lack of sound doesn't really help. What I can say is that the gravity flipping, and nightmare dimension part are impressive. If I had to pick the best aspect of the game, it would be the color palette.

the game is fine in terms of control. the formula of gravity changing has always been fun. this game needs audio, the art is fine but a little blurry and you can see a line of the border in the player art. there was also a bug where i was upside down and couldn't jump. but the core game is fine, if you fix the issues, this could be great!

That's brutal! My muscle memory for space bar being jump is too strong, so I would definitely recommend changing that to a different button. Other than that, it's a fun idea that had me going for many attempts. The random enemy projectiles felt a bit unfair since sometimes they would fire at me in the air where I couldn't dodge them, but it was interesting to switch between regular and nightmare mode.