This is an interesting game, and it looks nice. It does run slow for me as for the others who commented.
I cannot get past my third spider encounter (north of the T intersection) in the dungeon because the game screen goes black and then after about 10 seconds it says in yellow 'TypeError' and below that in white 'Cannot read property 'processAnimationRequests' of null'. I am running the game in Wine, but I'm not sure if that is the issue. Everything seemed fine up to that combat.
Cheers and good luck with your development.
Edit: Oh, hang on, third time's the charm I guess. *shrug*