Elypse is absolutely awesome! I haven't seen a game combine (mostly) platforming with an open 2D world in a metroidvania style before, but man does it work! This game also takes full use of Unity's lighting effects and it shows! I can't wait until this comes out!
As one of the comments mentions, this game would benefit from having accessibility features. The demo is quite challenging, and I'm sure the game gets more difficult from there.
One big thing I've noticed is the game's delayed reaction to control inputs. I don't know if it's a feature or a bug, and if it's a bug, I don't know if it's only an issue on my Windows 11 system or an issue broadly. But the character doesn't react to controller input immediately, and it requires player timing be extremely precise and ahead of time. It also made it near impossible for me to recover if I made a mistake, since by the time I'd notice and press the dash button, it'd already be impossible for the character to move before dying.