TL;DR: Typical pushover, virgin and mentally challenged MC. Everyone pushes him around and he's a dick to the one girl that has a right to be mad at him. Also, choices are meaningless. Now, I did find the girls really hot which is a shame, all I can say.
If you got a kink for being taken advantage of by women who are in a position of authority compared to you, then this game is for you. The mom and the big sister both treat the MC like a kid, calling him cute and pointing out how adorable he is when he gets shy, yadda yadda yadda. I'm sure there are some people out there who get a hard-on for this, but unless something like this is specifically your kink, then I don't know how you can enjoy it. He's supposed to be 21 so why are they treating him like he's 12? I can only assume that it's because he acts like a 12-year-old.
And yes, they do take advantage of him. The big sister literally pushes his head towards her ass to get off and this is forceful, by the way. The MC literally suffocates and he can't escape because she's so much stronger than him. I'm sure this qualifies for the "female domination" tag which is loosely used these days.
He's such an unlikeable little shit. The younger sister is right about him. He's an ass kisser, always sucking up to his mom and big sister and whine like a brat when they treat him like a kid, then he goes and treats the younger sister like a kid. It's really frustrating, honestly. Some girl literally falls on him, baring her tits out then she slaps the hell out of him, snaps at him and he apologises.
The choices are meaningless as well and you have no control over the story. Also, back to the MC, does every single interaction have to be about how his big sister treats him like a kid? Seriously, it's so fucking annoying and the MC's incessant whining doesn't help either. I hate him so much, honestly, he always throws Amy, the younger sister under the bus when he wants to let his big sister see how much he has grown up. He's pathetic and Amy is right about, he's an ass kisser.
As for the guys running the simulation, it makes the whole story meaningless. They literally make the women horny and teleport him to places and make everything happen. The whole journey is meaningless. Aside from that, there are only two sex scenes and they're both just blowjobs with no build-up, they just happen because the simulation demands it. Also, after one of those scenes, one of them decides to erase the memory of the girl for whatever reason, making it even more meaningless.
Also, he literally has the ability to turn back time and he got into a really messed up situation because of the bitches running the simulation, like he's in deep shit, but he doesn't turn back time god knows why. He did it previously just because he didn't want to talk to his sister, lol. This is truly stupid and not in a funny way, it's quite annoying actually.
I think the plot of this game is beyond salvaging at this point, but if the dev wants to make it enjoyable in future updates, he should allow for more choices because the MC's too much of a little bitch to give him too much control over the story. The plot's already a clusterfuck anyway, no need to try and explain why he's suddenly acting different since nothing makes sense anyway.