Good game.
The writing is solid, the gals are decently hot (yet still realistically "everyday" gals, not strutting supermodels), the MC and the gals go through some really relatable sh1t, and the horror setting works well enough that even this reviewer, who generally actively dislikes horror/post-apocolyptic/zombie genre stuff, finds it effective.
Specifically, the slow but terrifying threat posed to the girls the MC cares abt is so ever-looming, that when one gal goes on a little PTSD-and-self-hate-induced solo-stroll straight out into the predator-laden miasmic minefield, I was outright worried, and actively invested in the MC rushing out after her.
The sex is quite sparse, early on, unless you pursue Laura. If you focus Kallie, it's a really, REALLY slow burn, but that is realistic, given her situation.
I have not yet balanced out if one can get all sex scenes for all girls in one playthrough, but a look at the walkthrough makes me think it might not be possible, which adds replay but makes me a bit sad.
The MC and gals do a LOT of talking on their shared predicament, and on their individual issues/traumas, and this feels quite real and engaging, with ONE very notable exception: they sometimes keep the patter going even during sex, which is a problem (this does decrease as the game goes on).
It very often kills the scene momentum, and is also a sign the MC isn't actually all that great in the sack, despite seemingly being relatively well-endowed: if a girl can still form fully coherent sentences **while you are actively fvcking her**, you ain't doing your job right, buddy. All gals are natively actors, as few have never faked an orgasm (even those inner twitches might just be her skill at Kegels excercises, unless it is very obviously real spasms), and Oscar-worthy moaning and O-faces are common, so do not prove success, while a girl still able to hold a cogent conversation is a sure sign of abject failure.
Again, this does get less egregious as the game progresses, as some sessions later on do markedly have the girls losing linguistic ability as they get hammered.
All that said, TOXICity is a gripping tale that will eventually get you to some really good scenes, and where the girls always seem to happily and knowingly take it inside, but is not so rushed (aside from one gal who is actively looking to ride you almost immediately when you finally meet her) as to feel unearned and unrealistic.
Gallery has no ingame clues for locked scenes, but the walkthrough has the breakdowns.
All-round, a good game. Needs more sex to hit 5 stars, but it might be getting there.