Hell yeah, I beat all the levels! The game is fantastic: artwork, audio, progression - all is peak! But yeah, the game is hard. The game would be even cooler if there was a key for restarting the run, because sometimes you know you already don't have enough time for the future. And if you could practice the levels not when you already beat them for the first time, but when you first enter them, it would save a lot of time for me, especially with level 20.
Also, I encountered a bug. If you go START> PRACTICE and after that hit ESC and choose QUIT, then the level chooser will overlap the screen.
The game is great, it was an excellent experience to play it!
