I was able to play the game by pressing [space]. Pretty cool game with very interesting mechanics! It took me a couple tries to figure out how to respawn (although I still was only able to do that once). I think the controls on the screen could be updated to match what you actually do. I had died fighting the boss and it said press
y
to attempt to fight the boss again but that didn’t seem to work. Overall I enjoyed the game and music! well done!