There is quite a lot of things that I'd like to share as a player. That said, i tend to be pretty thorough with my impressions so buckle up, it's gonna be a pretty long one.
I agree with a lot of your observations. In fact, some of them are the main reason I just deleted the game and likely won't bother coming back for future updates.
On the character front, I was rapidly left not really wanting to interact with any of the other characters at all. I'm playing as a female MC, but Chris is a bit too butch for my tastes, and her more aggressive dom style really isn't for me (and I kind of agree that her aggressive flirting with every woman she meets - and straight up molesting my sister under the guise of sparring - really doesn't make me all that sympathetic to her existence). Sarah's ditziness could be appealing (and her character design is nice), but her kinks aren't necessarily something I want to explore. For a while Annie seemed like a positive alternative, but then in the drinking scene she goes full-on stereotype Australian slang and smoking, and it killed most of her appeal. It's a sad thing when the only characters you find attractive as potential love interests at all are the author-insert tutorial narrators.
As for the other NPCs, most seem mildly intolerable, including our sister (I get they were probably going for sibling rivalry, but it comes across a bit too hostile and abusive for my taste). Mike's about the only one who doesn't grate, and that's because he's more of a non-entity than a full character.
(And if you've got problems with NTR - like you seem to from your post - the aliens feel like they've been set up solely to either present NTR-flavored threats to your crew or to straight up molest most of the female crew eventually.)
I definitely agree with the limited time issues preventing real immersion when it comes to interacting with characters/the setting/the story, but considering I barely want to interact with them at all that's not much of a problem. The MC being a bit of a passive observer (like you mentioned) and the awkwardness of the game interface at times (trying to explore and repair the base) make it feel more like a chore to slog through than something that encourages or rewards action on the part of the player. There may be a deep and interesting story hiding just under the surface, or waiting to blossom once the foundation is out of the way, but I have zero motivation to care or even look for it.
I mostly tried the game because it seemed like a lot of people were giving it huge positive reviews, but it feels like I can't possibly be playing the same game those people were.
