Nice work

What confused me a bit is that you can move left and right with a and d but you can't jump, only with the arrow keys, but then I saw that I should have been using the arrow keys all along :)

I love the idea of gravity changes, but I tried jumping but I couldn't is that normal?
The graphics and overall mechanics seem to be ok. Great work!

Short, sweet and entertaining! I guess the way gravity changes is a little jarring (though totally in line with the game jam theme), perhaps some kind of audio/visual cue to indicate it's about to happen could be good? :o

Motion was a bit jarring when changing gravity and backgrounds, although nice, didnt really make sense. Solid platforming though