Wow this game is pretty awesome! At first, I wasn't sure if the main character was a girl or not and if it was mostly reversed rape from the thumbnails, but as soon as you start playing, you find out that you're dominating tons of monster girls into your realm.
The combat's pretty neat by gaining tons of new abilities from monster girls throughout the game. It kind of reminds me of Pokemon in a way since you tame monsters and name them. As you come back to previous levels, you'll find your tamed monster girls in their natural habitat being nonhostile.
Been a while since a similar game came out. Really recommend it!