Hey this is a neat prototype. I'm quite pleasantly surprised if anything.
Some good things are,
You've done some simple but effective use of puzzle and level design. The tutorial was quite nice to introduce the mechanics and the early levels help illutstrate some level design.
My caveats are that,
I got softlocked in level 2, when removing the yellow wall from the ceiling. I couldn't retrieve the final block to get to level 3. The jankiness detracts the experience a bit but you've definitely got something going!