The GF is super hot
The scenario is really hot
My issue with the game is as someone else mentioned, I feel like I don't have any frame of reference for the MC and GF's relationship. It feels more like the villain is stealing my sister than my girlfriend. For instance, why has the MC not initiated sex at all? For months? It's a step too far for believability. Not to mention that it seems like they never interact at all without the villain present or mentioned.
I love the GF tracker but I wasn't a fan of seeing the new sex interactions pop up. It makes it into a "check the tracker to see the new thing they did" situation instead of "check the tracker to see the things they MAY have done without you knowing" which is a slim difference but a huge one for me. It's the surprise of "WHAT?! When did she give him a handjob?! WTF!" that makes it nerve wracking to open the tracking app IMO. To facilitate that, there would have to be more actual working/flirting scenes. Once the sexual stuff really kicks off it seems all they do all day every day is blowjobs handjobs or kissing. It's a porn game, and thats the main sex delivery mechanism, so I get it, but it makes it an overload of the porn scenario instead of the gradual corruption that I personally think is hotter.
Not a fan of the sex-crazy drugs idea either, but I get it's a kink people have so thats a wash for me. Not sure about revealing the villain as a sex crazed manipulator right off the bat with his inner monologue. Yes, as players of the game we know where it's going. But some subtlety goes a long way. Instead of instantly knowing this guy is a pos stealing my girl, it'd be more interesting to see him as a fellow stranded wanderer working in a desparate situation with us when things go out of control.
All this is to say, I was really impressed with the game especially as a first time dev. I enjoyed it, the sexy parts were hot, I felt the dread necessary for this kind of game to function properly. I look forward to see it develop and your projects in the future.