The art style and colour choice is nice, but the sprite work needs to be adjusted to the resolution they are being rendered at. The outline of the player is lost during gameplay popping in and out.
I found it rather hard to control too, mostly because without seeing the cursor I was constantly overshooting the browser window and clicking outside the game window, causing me to die all the time!
A shame because I would have liked to play more of it, perhaps offer a windows downloadable?