The art was very charming indeed! I actually enjoyed it quite a lot!
It feels like some of the enemies are centered not on grid, but on the corner of it. It makes everything seem a bit dizzying at least for me. You also approach those enemies from the side to fight because of it and its disorienting a bit.
Several times game froze for me with enemies being on 0 hp, but combat continuing. And even closing tab wouldn't fully fix the issue since music continued until I close window completely.
Keys also appeared strangely... first key appeared normally, but second was really high up! (still was able to pick it up). Thinking about some comments here with third key missing - maybe it spawned even higher and was invisible because of it?
Sadly after so many freezes deep in dungeon I kind of gave up and didn't finish the game :( Closing all tabs and re-opening them again was a bit of a hassle! Played on firefox, so maybe that is issue with browser though...