Nice little platformer and great job for the first jam game! The controls and game felt nice to play.
I liked the first two or three levels. They had a great pacing, but the level where you phrase through walls and have to jump on the tiny platforms was a bit too frustrating for me. Eventually I learned I only had to press left/up or right/up for the same amount of time and beat the level/game though. Adding some more checkpoints in that level would be a good idea I think.