Nice game.
The skill tree is unlocked from the beginning. Not sure this was meant from the beginning of your planning for the game?
I had trouble playing the combat when using up the mana. Yeah there is some mana management, but its hard to use any mana that dont kill the enemy or you run out of health fairly quickly. Maybe I just never figured out the general tactics there.
I would like the controls to be a bit more fluent and responsive. I used QE a few times by mistake when i tried to turn around.