Great job with the concept! I really enjoyed how each skill serves a unique purpose and remains valuable as you progress through the game. The concept of "removing equipment" to regain your power is fantastic.
The mind control ability was really cool. it added a really cool dimension to the gameplay. The balance of the boss battles was spot on as well.
I didn't liked the controls however. I understand that the intention is to create a Diablo-like action RPG. However, due to the absence of a melee attack and how vulnerale the demon is, I personally would have preferred a control scheme akin to a twin stick shooter (WASD + mouse). This would have allowed for more fluid movement while attacking and retreating.