Impressive stuff! Even though the art is mostly placeholder, it look very professional. I'm not fond of creating an account just to try a game for a jam, but since it's an MMO, it can't be helped.
I would have liked being able to play in fullscreen mode, and also some sort of auto attack when you're close to an attacking enemy would be nice, instead of clicking once per attack. It could be in the options to give players the choice to use it or not. Besides that, I got to level 3 and had fun, there are nice diablo vibes here.
Great work! Out of curiosity, how many people are working on the project, and how long has it been in development?