You are playing god in your lab, abducting males from Earth-2393, specificaly the ugliest of bastards there is, transforming them to the alien substitute of an ugly alien bastard. After that, you are simply buying the human females off some kind of market, as well as furniture(more on that later).
So you have two boxes, on one box you have the females, where they can stroll around a big box, interact with furniture, basically your classic slave breeding pen management game. You drop the males from the other much smaller box that smells like ass hair and ball sweat, into the female box and you see the ugly alien bastard chasing the females. You can operate the ugly bastard to direct him to fucking a specific female and then the H-scene begins.
Now the bad part of the game. There isn't much diversity on the female body types and attitude, although it says so, they just stroll around the box doing the exact same shit. The male aliens are behind an RNG dice roll on what type of alien you'll get, how many times he can have sex and what type of H-scenes he can generate after catching a female. There is also some kind of phase timer and a qurrency, I dont really know what that was about, as I found the game extremely boring after a while because there isn't much to do other than see a handful of h-scenes. The graphics are fine maybe even good, if you reach 10 females and 10 males your game is gonna lag, I played this on my 7900xtx and it had slight perfomance issues.