Fun game! I really liked the visuals here! In fact, I'm curious to know what program you used to make them.
That aside, the game was simple and fun. My main feedback here is would be to have made the arrows disappear when hitting an enemy, as it was difficult to tell if they were taking damage from my arrows or not, and as well I was not sure what purpose the skulls served (though I collected them as much as I could nonetheless).
Great stuff!