The skill tree was a bit unintuitive, it took me a second to understand "unlocking" the skills, and initially thought things needed 10 points since it said /10
I understand the delay on movement to make kiting weaker but it still feels unresponsive... Maybe try having the player's movement speed ramp up over that amount of time so it still feels like the game's responding to inputs? You could start around 10% speed and SmoothStep up to 100% over those 15 frames or whatever. You could tweak the numbers to make it mostly identical gameplay-wise while still feeling better.
I felt pretty unthreatened until I got to a green guy with a sword 5~ areas in who "Flicker Striked" me (in PoE terms) for 18 damage and one-shot me which felt pretty unfair. I had even just put my first few points into HP just in case, at level 5 or so. I suppose I should have been focusing more on defenses, but spells were hitting me for like, 1-2 damage so I felt safe. (Maybe since I was playing a wizard myself?)
Overall fun and impressively "complete" RPG systems but I don't feel compelled to try again since I don't see any unique gameplay features to mess with or anything specific it made me want to try to do. Playing D2 you see skills deep down the tree that sound really fun, so you keep playing. Playing PoE you keep seeing new skill gems with neat effects and supports that compel you to find more so you can combine them in neat ways. A small feature that's unique and distinctive could go a long way.