This demo isn't a representative of the current build of the game, it's significantly more difficult as can be described in the comments. The combat was more floaty, slow and somewhat unforgiving, enchants were pure RNG, mobility skills costing mana/stamina, bosses being unforgiving, etc...
I assume the demo was taken down due to lots of difficulty complaints for an outdated build. Nevermind, itch apparently took the demo down for some reason.
A bunch of things were re-balanced in the current build on steam, alongside lots of polishing for the mechanics mentioned above. It's 5 USD on a sale and I would recommend getting it on a sale!
Here's a link to the steam page: https://store.steampowered.com/app/2768430/ATLYSS/
Here's also a link to this Alpha build that I found on my drive if you guys want to try it out. Note that the save from the DEMO will not be compatible with the steam build due to different formatting: https://drive.google.com/file/d/1AwgI3BKwoVORGd6z-jj--Jcdg8C62boy/view?usp=shari...