This is a great game, from graphics to sound design, to the conecpt.
I do have a problem with your choice about the levels.
It is frustrating to have only one chance to make a level, and then you are thrown into another one. You can't get into a flow state and I just got sent back to the first row multiple times.
Also, waiting quite a lot of time after you finish a level or die is also preventing me from getting into the game.
I got a bug which the UI got stuck and nothing happend, had to refresh. But it didn't happen again.
Still, this was a good game. Well done!