I loved the level design!! It hits the sweet spot of difficulty, not too frustrating and not too easy. I really, really liked the "ingame tutorial" where you force the player to use a mechanic right after acquiring it, to make sure that they understand it.
The only part that bothered me a bit was that in the end I got lost walking through the same rooms over and over again. Maybe if it had a map or a goal indicator it would be less frustrating.
The music works very well to set a chill mood and the art is simple but awesome!
Excellent game!