Character models seem decent, but based on the fact that this just released, and already has 4 poor reviews, and apparently almost no content that needs rework. Ill give it a few updates before i try it. Take the reviews as constructive criticism, and rework what you have. Personal suggestion as well, only do the languages in your native tongue, and english, dont worry so much about doing other languages cause it will just take time away at least until you have better ground work for the game. Hopefully you give this another try, or improve on future updates!
Definitley suggest what other people have aswell, go with more of a route of the character coming to terms with getting futas off, versus just being into it right away. The easy routes with that, or him being bullied into the idea or getting a crush on a character and accepting it as an idea, both are good to do assuming you want your game to have choice, other wise its just a kinetic novel.