Hmm, it's really rough at the moment, but it is a demo after all, and I did find the game's goofy and cartoony aesthetic very charming and the music was cool, so I think there is a lot of promise here! Hopefully I can give some good feedback to improve it for a final version:
*Combat was a mixed bag. On one hand, I found the death animations for the player and the enemies pretty cool, especially with how the world goes slow-mo on enemy death. But for everything else, however, it felt incredibly unsatisfying as there was practically zero feedback for hitting someone. When you attack someone, they need to react in some way, like being pushed back, playing a hurt animation, flashing white/red, playing a sound effect, producing a hit spark, anything! Would also love if you do the air attack on someone if the player would bounce off of them.
*I liked the player expressions in the corner of the screen to indicate health, but I wish there was a bit of a health indicator on the player itself as well. Would love if they, when low on health, had a different idle animation like they are clutching their shoulder, or at the very least have them pulse red or play a heartbeat sound or something.
*Lot of controls aren't intuitive: I assumed that my dash was like most games where I just have a normal single forward dash, but was surprised to see way later on that it was a multi-directional double dash. I also found it confusing that when you attack while holding forward you'll go stock still, yet if you move forward and then quickly let go of movement and hit attack simultaneously, you'll attack while sliding forward instead of going still. I would prefer consistency, leaning towards keeping the player's momentum when attacking instead of cutting it.
*I was a bit frustrated that you can't access the long range slash when you're in the air, instead only being able to do the spin attack. I'd prefer if you could do the long range slash in the air if you do a neutral jump, but do the spin if you're moving, or maybe do the spin if you press down+attack or something, I dunno, up to you.
*Navigation of the levels was very confusing: too many blind leaps of faith required and I ended up getting stuck at this gray door with red highlights that would beep and make it snow whenever I touched it.
*Would love if things that you can interact with would have a little interact icon pop-up above them when you're close as sometimes it wasn't clear what was interactable.