Good game, I managed to get to level 7.
- If you can attack with the mouse, have the player attacking towards the mouse is a must.
- Enemies aren't that complicated, but that's only because the player doesn't have any special ability.
I think you should add a dash so you can add more difficult enemies and have a better combat system.
- There were many dead ends which led to nothing. It's fine to have some, but maybe put a reward. A blue gem, HP, even a collectible such as coin can make you feel better going into those dead ends.
The art is good, nice audio, and cool concept.
Well done!