I loved this Demo, it has enormous potential, I can't wait to play the full game!
memes aside. This looks great! The movement is clean, especially when you get all the abilities, the combat is good too. Overall just very well designed and plays good for a demo, with some tweaking it could be a fantastic game.
On to the fun part that I'm making this comment for: it turns out you can actually get through the underwater section in the bottom right of the map! I can tell you're definitely supposed to have some water breathing ability since the timing is very tight. Basically, using either the dash or the backdash relic (much harder with the latter) you can just barely get to the second air pocket and refill your breath bar by bouncing on a spikeball.
Hear me out though: I think you should leave this in. Most casual players would try to get through a few times and realize they're not supposed to, and even those more determined to sequence break would think it's impossible. It took me nearly half an hour to perform it a single time with the backdash, and that was with invincibility on. I think it would be a cool thing for future speedrunners to use, but won't affect normal gameplay.
P.S. I like that there's just a hole in the floor with no room transition cus you're not supposed to be here lol