When I died the screen turned black, pressing buttons did not fix this. When I refreshed the page my savedata was gone. I'm using Chrome & the music was still playing, if that helps.
The art looks nice, especially the animations and glowing stuff. There could be more going on on the screen though.
However, while the game is combat- and exploration-driven, their implementations offer little satisfaction to me. The moment I killed my first enemies I already felt like I had mastered the combat, given its simple controls and enemies.
The same applies to the exploration, whose main appeal lies in puzzles that are quickly solved using only your memory. Not that they should be more complicated, but they don't even make me feel smart.
Regardless, the design choices seem to complement a more laid back experience quite well, though I can't say for sure given that I'm just not into that. Besides the crash there was little that downright annoyed or bored me, it just wasn't memorable or enjoyable enough to play more.