The game was a bit squished for me for whatever reason... I included it in my compilation video series of all of the GBJam 5 games, if you'd like to take a look :)

A nice little platformer. Mabe you should allow the player to resize the window or something.

The lack of checkpoint can make the game a little frustrating at times (especially in the 3rd level).

Unable to play game, the window is too small. You should consider adding a scale window feature so you can make it 2x, 3x, 4x bigger so you can actually see the game.