I kinda skimmed through it after realizing none of the choices are tracked.
I think it could have been a pretty decent start. I liked the dialogues and character archetypes. I can see a glimmer of potential if you take some time to learn to code and brainstorming the routes.
Some tips.
The most important character in the game, the wife, has too many different actresses playing her. I guess you will stick to that one blond chick for sex scenes, but try to stick to that girl for every pic of her. At one point, there was a totally different brunette used for her pic.
I am not a programmer, but you need to use some variables and flags for a game like this. How can you add routes without it?
As for the routes, don't go too crazy with it. If I am seeing your intentions right, you should stick to 2 main routes. Harem and NTR. You could make subpaths. For example, for the "harem" route, you could be faithful to the wife for a romance route. For the NTR, one subroute could be the MC getting all the girls stolen eventually and feeling miserable and the other could be a willing cuck that enjoys getting humiliated.
Right now, I feel like you are on track for a mixed route. The MC is generally pretty outgoing and competent, having chances to bang other girls like a chad (I think... I skimmed it). So when this MC gets cucked by John at the end, it could result in some cognitive dissonance, depending how well it's handled. I like both harem and NTR, but I like to get into the mindset prior to playing. If I'm playing a "bang all the chicks" chad MC, it feels off when he gets cucked unless it's handled with finesse. If I'm going for the NTR route, I want the MC to suffer and feel weak. It's not impossible to do a mixed route though, just very hard to pull off. Rise of the Crime Lord is one I can think of that pulls it off spectacularly, although it's dual protagonist.
Regardless of what you choose to do, the first step is to plan out a broad outline of the routes and think of the coding required to support the routes. Make sure it's feasible for you.
*One final note. A lot of devs don't quite get the power of NTR when attempting it. I think you blew the load too early. If the MC catches the wife getting dicked in the first release, there is really only one place to go from here, the willing cuck route. I mean, that's the typical western way and many people like it. I think it's more effective if you tease the NTR a bit more and then blow it up somewhere down the line. Play with the uncertainty, paranoia, maybe some circumstantial evidence like questionable social media pics or whatever. If you are willing to show things outside of MC's POV, you could even show the wife's scenes without doing the "NTR reveal" too early. Anyways, just some thoughts that you could consider if it lines up with what you wanted to do.