Tl;Dr: Good start, but not much here at all. Come back later.
The game has great presentation from the start. The typical horrid, same faced anime Koikatsu models actually look unique and appealing. The concept is interesting and sets the stage for fast lewd content to the side of a slow burn harem set up. Writing is actually decent for once, at least for character dialogue.
What is currently rough about the project is the lack of stuff in general. Outside of their scripted affection gaining parts, the girls don't really do anything. Plus, there's barely any scenes with said girls. I think, not counting the twitch streamer, there's 2 sexual scenes. The only penetration we can watch is a couple banging at the gym. Plus, one of the girls lacks much content at all, which you discover very quickly. Because of that, the rest of the experience is dampened as you realize that there's not going to be much exciting to work towards.
This game can very easily become a 5/5 masterpiece, and it can easily become abandoned. I feel like it's been shipped far too quickly. Despite creating this interesting world that should have sex around every corner, besides a few screens it feels barren. I'll eagerly keep my eye on this one, but I won't hold my breath.
Also, there's not enough content to justify a 3 gig download at all. If this game becomes big, the dev better learn to compress. Again, probably another sign this was shipped too early. Best of luck to you, dev.