I really like the concept of a Diablo game that can be played in the browser. The pixel art is very charming but I'm worried you'd get burned out trying to draw so many different sprites, especially with them uniquely displaying on the character.
Needing to click on the text and not just the whole slot in char. select was annoying.
Walking seems really slow.
Zoom options are needed, you can of course use a browser's zoom but it also makes the UI larger. Separate options for those would be good. And if you zoom out too much, in Firefox at least, the screen goes black and doesn't come back.
Enemies take damage at the start of a swing and not when it connects.
Please let me hold down LMB to keep attacking an enemy.
Sometimes when resetting and going into the dungeon you only get a small square room.
Looks like dungeon gen. can generate rooms you can't reach.
I was clicking around a lot in the overworld testing the responsiveness, its a bit slow I think, and noticed the framerate really starts to degrade after a while. I became so bad the game basically froze, like 1 FPS.
I really hope you keep working on this!