Very fun game! Everything was really well done, and I had a lot of fun playing it! This is the type of game I'd be so interested to see speedran, but I could never do it myself. It's a simple concept but you did a really good job with it, I especially loved a lot of the level designs in the first area.
The only bugs I had were with the pushable boxes, one where whenever you respawn they get flung to a different position, which has to be fixed by going to the previous room and coming back, and another where in one specific room on Level 2, there seem to be invisible pushable blocks right next to the visible ones, making them both unpushable.