Really fun demo, I can recommend this to anyone. Took me about 10 minutes to complete and I really want to play more!
I especially like the jump height and freedom of movement in the air. The Boss seemed quite easy when spamming the axe tough.
Thanks for playing! I'm currently working on updating the demo, so there will be a new extended playable demo available fairly soon. Regarding the boss difficulty, I intentionally incorporated a Mega Man approach, where bosses are vulnerable to certain weapons. In this case, the axe is intended to be the Skeleton's Achilles' heel.