Entertaining game! I think it has potential. You can easily add more levels. The simple controls and room design go well with this type of puzzles. The music is dope.
I didn't find any major flaw in the game mechanics. Though I tried playing around and threw a cube inside a wall. I wasn't able to retrieve it. I had to restart the game to get it back.
I get that, given the time limit of the jam, this kind of details might not be the priority, but if you ever plan to continue working on this game, maybe you can set the walls such that the cube just bounces off.
Overall, I think it's a fun game. It also has a lot of potential.
Good job!