This game feels very polished, I like the music and the visuals and such, it's all very cohesive. I agree with the other commenter about level 4 though, the pattern is very easy to understand and intuitive, but the way it's laid out is a bit cumbersome... the level is pretty lengthy compared to the ones before it, and having to click 3 more times just to loop around to what you need can get tedious after dying 1-2 times, suddenly it's more about finding & clicking start than platforming, haha
Overall, this feels like a demo for a really good & polished game, I'm impressed! Very cool game