Good concept
Artwork were ok and for both arms you had two different attacks you had to dodge each in a separate way, which was good.
What I don't particularly like is the aiming and shooting. In the beginning you simply aim for the head and hold the mouse button throughout the whole game.
You could have made it more challenging by adding ammo packages and reloads when your magazine is empty.
Also; the death effect. The demon just goes berserk twisting is head around insanely, but I would have preferred a more violent death effect, or at least something that sustains the "Hank dies. He goes to Hell. Help him get back."-part that's more animated than this.
Good concept, but too many loose ends and points for improvement for a higher score I'm giving you.
But I hope to see a new game from you again next year :D
7/10 and 4/5