Great game!!! I love the pixel art and the main theme was very nice. Presentation is on point!!
A few observations:
There were a few instances where i got softlocked in level 3 and 5, so i appreciate the addition of a level select!
As somebody already mentioned, it's a little hard to understand the mechanics and controls if you hadn't read the game's page.
Also, this isn't really a big deal, but i wanted make you aware of a little techincal issue: alt+tabbing seems to break the game, and make it impossible to tab back in.
Despite all this, this is a very nice and original game concept and I really enjoyed!
Great work!