It's like I'm playing Diablo 1 again! The atmosphere and feel of combat are pretty much perfect.
Made it to floor 4 but got stuck as I ran out of health potions. Are you planning to add a town or shops where you can buy more consumables?
I like the idea of weapon arts. The shield skills seemed a bit cumbersome to use in the middle of battle though. Maybe I'm used to just clicking on enemies and watching them die instead of having to time blocks/parries. Perhaps the skills would be better as buffs that you can just activate at the start of battle?
Also wish there was a confirm button when increasing attributes, I leveled up the wrong ones by accident.