Really cool concept! It would be nice though if i could press a key to restart on my keyboard, and if each level restarted a bit quicker. It's a bit annoying to have to wait a few seconds. Also, the default resolution is a bit big on my screen (1080p), so that i have to scroll to press the full screen button.
The art is really cute btw, and the sound effects are very satisfying! And despite the simple concept, the puzzles get quite difficulty! Good job!