I really liked the art and lighting. The only exception was the jumping sprite, which resembles a creeper face from Minecraft. I know it isn't, but it pulled me out of the immersion a little.
I loved the enemies, both art and their movements, but they had a little too much HP for the attack. It seems like you padded the HP a bit to make up for it, though.
The music was lovely and fit with the art and game style.