Caribdis, this is a fucking masterpiece. I plan to support the game development either here or on Patreon but I legitimately can't believe we get to play this for free. As for any potential players trying to decide if you want to download Eternum: DO IT. DO IT NOW!
A review for the ladies in particular:
TRY IIIIT. This is one of the few VNs in its class where the male MC has an actual, well-rounded, likeable personality. Orion (or whatever you choose to name him) is kind, thoughtful, loyal, brave, clever, and horny, instead of only the last one. Even on the full harem route, it doesn't come across like he's just out here collecting chicks to screw; we can see that he actually cares about each of them, and we get to see why they grow to (or already do) care about him, too. While having hot nasty sexual encounters! Brilliant. Oh, and it's funny af?? I was laughing by the end of the first scene.
My only real criticism is the body shaming that pops up here and there, but it only comes up a few times, and after the first playthrough I just skipped through those moments. Obviously, there are some of the usual gratuitous panty shots, near-brokeback poses (my spine aches for these babes, but they do look damn fine), and supersexy outfits, but, I mean, that's par for the course here. Besides, the clothes generally make sense for the scene, and the few times they don't, the story and characters are still so goddamn good that it doesn't even matter. The renders, writing, and soundtrack are top-notch, too. It's not voiced, but definitely recommend playing with the sound on (though maybe with headphones, unless you live solo or are very open with your housemates).