I played it for a bit and got kinda hooked, but i also ran into some bugs/issues:
-Some enemies spawn into the walls and stay stuck there
-I couldn't use the middle mouse button because the browser somehow caught it instead of the game, resulting in the website scrolling around while i was playing.
The game is pretty hard (to me) and the pacing of the attacks took me some time getting used to. I think having the "energy" bar under the character, or closer to the center of the screen could be better, cause glancing at it takes your eyes away from the fight
The boss fights are pretty hard, and it would be cool if health potions could be picked and stored in the inventory for that kind of fights (maybe i just didn't figure out how to do that though)
Cool visuals and sfx too!