Like the others said, movement could definitely use a rework. Having no air control made things way harder than they should be.
I enjoyed using the repel magic as a wall-jump, but the execution felt too random at times. Sometimes it works as I'd hoped, sometimes it launches me sideways, sometimes not at all.
And a minor thing I disliked was the fact that Mana potions were bound to Q and Health to E, even though Health appears to the left of Mana on the HUD.