I wish more games this long were made in such a short time. ~3 years from creating topic to ending and game is longer than many 5-6 years old products that aren't even half finished.
It's a nice survival horror-like story with good plot and pacing. It keeps player entertained from the very beginning to the end. I'm writing it as a person who don't really like horrors and find them boring. MC here is a kind guy who's not afraid of risk and bravely fight against all odds to keep his LIs safe and save the world by the way. If it comes to narration, you shouldn't expect any meaningful choices. The only thing you can decide is with whom you want to talk at the evening, in which order do tasks or how much exp/gather food you want.
Game have management system that's not hard, if you have some experience, even if you play scavenger (normal) mode for your first run. There's also a feast (easy) mode which seems to give you no worries about management, but haven't played it, so can't confirm for sure. Anyway, by using search you can find plenty of console commands, if you decide to start with scavenger, but start struggling. That's not necessary with even a small amount of effort, but can be helpful for people who'll get some troubles. You can lose, but it's not easy. You can also expect some easy minigames and fight, nothing to be worried about, if you aren't first time on PC and have at least small hand-eye coordination.
Harem contains four very different LIs connected in one purpose. To survive... and love MC. Ok, those are two purposes, but second one is obvious. It's a harem porn game after all. There are many events that let us bond with LIs. They're quite short, but effective. For bonding whore like me it's a little low, but for people who don't seek it in games as much as I do it should be more than enough.
Very nice graphics and a lot of top level cutscenes, both during exploration and sex. Creampie scenes comes later, but you can expect cum dripping ones for almost all game long. Characters have original look, they remind me some old games with NPCs looking like made from playdough, but on advanced level. Not something that fills my taste, but a nice refreshment for sure.
Plenty of sounds, it's much better to listen some small "heh" instead of reading "chuckles" every few minutes. The thing I really miss here was cuddling. There's an option for more or less deep talks in front of fireplace, but LIs are always sitting separated from MC. There's a frame with cuddling at few nights, but most of them it looks like MC sleeps alone and it doesn't matter that Mia is sleeping with him.
That's definetely an extraordinary project with balanced plot, bonding and amount of sex scenes and it's good enough to forgive small logic holes. I can recommend it with a clear conscience to everyone who's not afraid of some blood, death, reading about very immoral experiments and don't seek for specific kinks.