This is kind of similar to an idea (but didn't use) I had when I was first thinking of ideas (cleaning up after the player of a game). I like your interpretation of it.
I liked the art style, but is there no music? (Or is it just not playing for me for some reason?)
I seem to remember there being something I didn't like my first time playing, I think maybe that there was too much waiting for things or maybe movement seemed to slow, but that didn't seem to be as much of an issue the second time (when I already knew the solution).
I noticed a bug my second time playing: If you press R to reset while holding a block, the block will fall through the floor after resetting.
Another minor issue: The moving platforms look like they should be semi-solid, and they almost are (since you can go through it if you stand under it, although it looks a bit glitchy), but also they aren't (since you can hit them from the side). (Is that hard to do in Unity?)
Overall, I liked the game.