Hey really cool idea! Didn't ever actually think about playing as the level! I like the whole upbeat atmosphere of the game. And it feels really polished as well. I'm not a huge puzzle game person, but I was able to beat it with only level 9 being a bit challenging (or I mean 10 was super super challenging!!)
Don't really have much negative to say. For the first level I didn't really know what was going on as I just saw the thing sink in and I won, but after that it was pretty clear. I'd say maybe the only thing, and idk how you would fix this, but by level 9 it did feel a bit less like I was playing as the level, and more was just playing as the grey boxes with inverted controls. But again that's like me being super nitpicky!
Anyways well done with this! Very good work!!