The AP-based approach to combat is really interesting. The only complaint I have is that I had to beat a lot of enemies by repeatedly doing attack -> shield block -> wait (if AP is low) which got tiresome after a while. Maybe shield block can auto-target if there is only 1 enemy? Also, having a system where you can avoid all attacks would theoretically lead to a situation where a lv. 1 character can defeat a lv. 99 enemy - curious to see how this will be addressed in the full game.
Dungeon exploration felt pretty good - it felt worth it to go down each "path" to get a chest full of items at the end. New weapons seemed to make a big difference in combat effectiveness. Ranged feels very different than melee.
The game's difficulty is BRUTAL. Especially the goblins at the end. One mistake or misclick and all your health is gone in an instant. I eventually made it to the end but died a bunch of times lol.
As others have mentioned, equipping the skills with the number keys is a bit unintuitive. I also accidentally unequipped my skills a few times - I think it was when I right-clicked to cancel a skill, which somehow unequipped it? Otherwise no real issues with the UI.