A pretty solid-looking early version. Pixel-art is on-point, movement feels fine (even though a shorter jump/hop would be great) and the regular art is outstanding. However I do feel like the attack's range could be a tiiiiny bit longer, because it feels a little short consider how enemies get to launch projectiles. Another thing that I felt was off is the lack of sound effects, music, but is understandable consider how this is a demo, and I would actually love to help with that. Other than that, very good job, looking forward to how this is going to turn out.
Glad to hear that it will be modified. And about the music, I could help by composing it if you are interested. In case you are, here is a portfolio: https://soundcloud.com/wakerlink/sets/music-portfolio