Really fantastic demo! Enemies were fun to deal with. Telegraphs were well designed. Boss fights were fast paced and exciting. I really enjoyed it.
In one of the horizontal scrolling levels, I bonked my head on the top of the view screen which killed my vertical momentum and felt jank. If you make the scene a bit taller and lock the camera to player with horizontal only movement, you can allow the player to jump a bit higher than the view rather than bonk. It feels nicer.
Congrats on a great demo, again.