I don't know much regarding this game's development, and the guy gets instant bonus point just for bothering with a proper 3D game-like entity instead of Renpy VN #7456, but man if this is the result of 4 years of development I can't imagine how long it would take to make it playable.
As far as I can tell, it's only one level, and there's not much to do in it. Some of it can even break, such as when, after a not-so-great platforming section, the game tells you to charm your first enemy. The first time I attempted this, it just flat out didn't work. I didn't bother with a second attempt since I was now trapped in this area, so I restarted the level and walked around it (something I would greatly recommend regardless of weather or not you know the controls, just look in the OP and save yourself the trouble). There's then a puzzle section involving using spells to move physics barrels onto switches you can't reach. This would be nigh impossible if you were to actually use the physics system, so it instead plays a scripted event, one that completely removes your ability to move unless you press the teleport button. Then you enter the "combat arena" where there are some enemies scattered around that you can either charm or kill, and that's about it. You can mess around with the spells or try out the charm system which as you will quickly learn serves zero purpose since charmed enemies won't do anything other than follow you or wait around. They won't attack enemies or help you out, and because this is a porn game I can complain that they won't even fuck you, for that matter it's a little unclear how exactly you get the sex; charming enemies doesn't seem to cause it directly, I'm under the impression you have to charm the enemies during combat? But charming is something like a 5 second channeling process which can be interrupted by certain attacks and since every enemy knows your location once you're spotted, and since there's no after hit damage delay, you just end up dying if you attempt to do that. That's fine as a game mechanic but if all you've got is one VERY short demo level then why is there not an easier or more comprehensive path to the very draw of the game - the porn?
The protag is hot, the animations are pretty decent all things considered and the combat is more or less functional, along with the spell system. There's a foundation for a game in this but that's all there is. As stated, it's VERY short, like 20 minutes tops unless you want to struggle with the combat arena to get all the different animations, then you're probably looking closer to an hour.