This game is REALLY cool, the only caveat I have is that the game felt kind of slow while the skills and bosses were more suited towards a faster pace. The easiest way to fix it is just to up the player (and bosses) walking speed. Another slight hangup are the controls, I'm personally just not used to arrow keys and they felt quite a bit weirder to use than wasd, and "c" is kind of an odd attack button.
Also... EIGHT BOSSES!? I KNOW a LOT of time and dedication went into this game
Overall, this has more than enough capacity to be an AMAZING game