That was rather nice actually. Short, sweet and calming. The aesthetics were nice and peaceful and I loved how the character looked as hand-drawn as possible lol. The levels of the game looked a little out of place wrt the backdrop though. I kind of wish the platforms in the levels also looked sort of handrawn.
Maybe something similiar to the style of the player would have been perfect. Badly drawn rectangles or something of that sort. I'm also not sure if this was intentional but something about having the cube rotate by a step was so satisfying lol. The implementation of the theme is rather nice actually. I thought it was a little frustrating at first having to go back to the previous level, but it made sense and was used nicely when you got to the end and had to get to the first level.
The music was great as well, not really any faults wrt sound. This was a great entry overall and I honestly enjoyed it. Well done :)