I really liked the idea of creating blocks and portals that would speed up your projectile to break certain walls. Despite missing any sfx, I could tell when I was dealing damage or getting hurt. I think that the jump speed and gravity need a little tweaking. And an in-game options/quit game menu would be nice to have. I did like the art and the music. My only problem with the music is that changing rooms would restart it instead of it continuing to play through scene switches.
Congrats on your work and submitting to the jam!