Ok, the basic game play is ok. but there are some strange/wrong things.
First a mute button: you NEED one for sure.
Armor: why does the enemy gets just one damage as long as I have armor left ?!?!? Strange.
Some Sprites: It's not much work and your game gets better (at least i thing so) if you would add some pixel-art images of the enemies.
Keep going and i would love to play the next version of your game (hopefully with a mute option added).