Very nice
Graphics are really good, there could be more detail on the walls and such, but that can be done on future games.
The customizable keys are a big plus. I was able to make the health potion to the 'F' key which made it easier for me.
Personally I would suggest people to put it in window mode so that they can use the wheel. A suggestion would be to have the mouse wheel movements stay in the game, so that the browser doesn't move when you use the wheel. Not sure how to do that in flash, but it's a suggestion.
overall, not a bad game. 10/10 5/5