Nice animations, divers and creative ennemies, suitable music. As other have mentioned, there are sometimes some technical problems but nothing that made the game unplayable to me.
The only suggestion I have is to change the Enter key to any other key the left hand can press (space, or just click?), because the right hand is busy with the mouse. And also a level select.. because I crashed (out of memory/using latest Opera on windows 10) and don't want to restart the whole thing.
Anyway amazing job, well done!