Unforutnately I couldn't even beat the first boss. My main problem here was the browser. While dodging with the elve he constantly tried to set bookmarks and one time he must lost the focus. Which is bad because pressing ctrl+w closes the tab (not your fault - I just have to complain about the browser!)
Overall a pretty nice game. Very nice implementation of the theme and I like that you become reborn as a random character with different abbilities.
But it felt kind of unfair that a boss attack can deal multiple times damage to you. So when caught in the wave it has eaten up all my hearts except for one.
Really good work. Added it to my collection - may one day I will also see the other bosses two (depenending on how my browser will behave...)