It took me a few tries before I realized that I need to aim with the mouse and not where I'm facing. A bit counter intuitive, I died a lot because I was clicking away from the enemy so I was hitting down instead of up (for example). I think a good fix would be to add a special cursor in the game for your mouse, like a giant aim to help. I notice that the sword points in the direction, but it's a bit subtle in my opinion!
I agree with the others that a health bar would be a good addition too, it's very easy to die!
The art is good, the color limitation makes it look like a Game Boy game and I like it.
Good job on your submission :)