A little tough at times with the close spikes and leaps of faith, but I often enjoy platformers on the more challenging side and the instant respawn instead of lives made this very enjoyable!
I got to the boss but was unsure what I was supposed to do? The best I could figure out was just to survive and dodge the falling rocks, but I would always die eventually before anything happened :P
Also, I thought that the main character's sprite was very cute!