Surprisingly smooth and responsive movement - great job at that! Also, liked the simplicity and neat minimalistic visuals.
Unfortunatelly, as some people have already pointed out, the game becomes repetitive and a bit tedious pretty quickly. The ability to turn yourself into a block and start over is very interesting at core, and seems like a thing upon which you could build some really interesting mechanics - sadly, you didn't use its full potential.
I'm sorry if my criticism sounds harsh - it's still a pretty good submission compared to whole load of other entries in this jam! The game is overall very well-made and feels and looks really polished. I would just really, really advise you to take more "creative risks" when it comes to making a jam game in the future :)