Haven't played yet there are two parts
part 1 0.150
part 2 0.190
so do i download and play part 1 first or ???
*figured it out
btw how many routes and stuff are there tell me
You can play Part 2 without playing Part 1 just by answering a few questions, but without playing Part 1 you may not know what the answers you want to give are.
So playing Part 1 is still highly recommended.
There are 5 main routes to the story based on the LIs you can pursue - The Good Wife route, just pursuing Liam the husband, which is where most of the actual sex scenes are currently in the game. Or the Filthy routes, split into Dylan (the son), Sam (the neighbour's son), Ellie (the daughter) and Patricia (the sister).
You can play any of these in many combinations. Personally, I play just the Ellie and Patricia routes. Or you can pursue none of them and just focus on the side characters. Whilst it's part of the Dylan route, there are players that ignore that and just play Aiden's blackmail. All are valid ways to enjoy the game.