The gym minigame is broken. Not like, crash to desktop broken, but the numbers don't add up. You click the dumbbell, your strength goes up by one, but the energy bar drops by like a third. Meanwhile the university study action takes the same energy but gives you intelligence AND sometimes a random cash bonus. Makes no sense. I spent my first ten minutes just grinding pushups while my little grey alien got progressively more exhausted, and for what? The first girl you meet at the club doesn't even check your strength stat. She checks your confidence. Which you can only raise by working at the office. Which requires money. Which requires... you see where this is going.
The fucking itself is straightforward. Point and click. The alien's little proboscis thing extends, the girl moans, numbers go up. There's this one redhead in the library who has a whole corruption arc if you keep visiting her, starts with shy handjobs between the shelves and escalates to full invasion stuff in the bathroom. The sound design during those scenes is just wet squelching noises on loop. It's kind of hilarious actually. I had to mute it after the third encounter because it started sounding like someone stepping in mud.
The eating mechanic is where it gets weirdly compelling. You have to balance your budget between instant noodles and actual nutritious food, and if you eat garbage too many days in a row your energy recovery tanks. There's this whole hidden metabolism system the tutorial never explains. I discovered it by accident when my alien got fat and the club girls started rejecting me. Had to spend a week doing cardio. In a porn game. I'm not even mad, that's just funny. The invasion tag makes it sound like some grand conquest but really it's just you, one horny extraterrestrial, trying to get laid while managing a sleep schedule and a part time job. Peak adulthood simulator with tentacles.