Hey, I liked this. Some of the things I would work on, the font is a bit hard to read, especially on the character select. The fancy font is fine for menus, but for things with important info like the CS i'd go with something easier to read. Which you did do in the tutorial screen tbf. I think the tutorial screen works fine as a cheat sheet, especially for something early in development. But I wish there was a way to access it in game. Also some pop up tutorials. Like when you go upto the tree (tell the player K, L to attack/defend) or when you go upto the button (E to press the button ect). I found the controls a bit weird in general (the K L mostly), I don't know if its because I don't play this sort of genre and thats standard, but my instinct would be to place the attack/def buttons on the mouse. The enemies where a bit spongy, they took a lot of hits and there where a lot of them very quickly. I'd give the player some easy wins in the first two minutes of the game (unless your going for a dark souls thing, in which case ignore me). I found it easier to just run past all the enemies, and got hammered by the Boss. If you want people to clear areas first, just don't show buttons until youv'e killed all the enemies in an area. Sort of like how Hades does rooms.
I only played the first class, because I didn't know how to play the game, so didn't know what difference it would make. But the one I played was cool. I couldn't comment on the multiplayer aspect. I did like the art direction with the characters, it reminded me of early runescape. It would be cool if you did all the environment in that style, the worlds a bit barren atm.
Good luck on your project. Hope you continue it.