Having a lot of fun so far! Love the fast paced combat and am really looking forward to an even harder difficulty in the full version!
If there's anything I'd comment on, I'd say it would be nice if the map would stay open after changing floors or getting back out of combat. I could see it getting a little tedious having to reopen it every time. Also I'm not sure if it's just for the demo's sake, but the encounter rate is pretty high. It would be nice to be able to explore a bit further without getting into a fight, especially with as complex of dungeons as you seem to be making (no complaint there).
Also, I gotta say I love all the little names you give the groups of enemies.