Alright, let's tear into your game. Oh I mean, give you some feedback ;-). The visuals and music are great, so it's really just a matter of fixing the bugs (unless they were intentional of course).
The first thing I noticed was that the text on buttons are missing (I reloaded several times); normal text seems to be fine. After that I found out that spike platforms can kill you, when you hit them from the bottom (so where there is just normal rock). This is mainly an issue due to the poor platform placement; I often hit platforms above when jumping in level 1 (not an issue in other levels). In level 2 enemies seem to take multiple hit to kill, but there is no feedback when I hit them.
Then we come to level 3, oh yeah. I jumped over the vases at the start and the character model disappeared (probably got stuck somewhere), but the camera was looking at the place where the model should be. This was when the little restart button in the top right was pretty useful. Upon reloading the big enemy was already at the staircase and I could kill him in just a couple of hits. When I got to the throne two button appeared (without text). I clicked the top one and my browser gave me an error message; the game had crashed.