I liked this concept quite a bit! Though I did frequently have issues with navigating the playing field, because the camera constantly changed focus towards the other mage I could never tell the actual direction I would go, and found my character just standing still even when I mashed a directional key at times. However others mentioned this previously.
I thought the concept of having a sexual battle was pretty cool, and the shielding/shooting mechanic was good. I could see this turning into a legend of grimrock styled adventure/puzzle game with boss fights at the end of puzzle rooms. As well as different abilities and combat styles evolving if this were to develop further.
Good job! I really enjoyed this game!