The boss didn't seem to take damage for me? If it did, the health bar didn't show me. Also, I think the skulls could do with a little more spacing between them or slowing them down a little when moving left or right. Other than that, really cool idea of recharging on the edge. The art and lighting looks really nice (Though to nitpick a tad, maybe have a little more contrast on the character?), the gameplay itself is pretty easy to pick up and play, and the music is really good. Good work