A very promising start.
The setting:
The basic premise is that aliens made contact with Earth in search for protection from another alien race, set on conquering the universe. These refugees are eventually accepted by humans for the most part, and they work together towards finding a way to repel the invaders. This initiative culminates in a huge protective shield being cast around the Earth, but some monsters manage to get through, and humanity created mechs to fight them.
The society:
While we have only seen a small part of how this society functions, it currently (as of v0.1.0) seems to be female dominated. All known positions of power are held by them. Common vices like tobacco and alcohol are banned, people don't seem to know that meat is a food, half of the cast seems extremely prudish. Some of the cast view the earlier humanity as primitive and self-destructive. This comes into a huge contrast with the protagonist, who is a soldier from the 70s, although there is at least one character who is as "bad" as him.
The protagonist:
This is probably the most controversial part of the game. He is depicted as an extremely straightforward manly man, who is prejudiced agaisnt women and views them as incapable of holding important positions. His behavior makes sense, considering that the 70s were not known for powerful women in important positions. Additionally all the girls dress provocatively, even for our modern standards, so he thinks that they are sluts that fucked their way to the top. He tends to be overly aggressive, even when choosing the milder options. But keep in mind that some of the cast, especially the vocal ones, are equally offensive and prejudiced against him.
So while this isn't necessarily a "protagonist" problem and more of a "the game has a scenario that includes the two extremes", If you can't stand that type of MC, then you should avoid it for now because despite having some milder dialogue choices, the fact remains. It's obvious that there is going to be a lot of character development down the line, both for him and the rest of the cast. If the last scene of this update is of any indication, the dev has put a lot of thought to how this will play out.
I personally think the protagonist is at a great spot. I expect him to eventually gain more respect for the opposite sex, but he seems to be exactly what this world needs.
The girls:
A fairly diverse and beautiful cast. Everyone reacts differently to the protagonist and they generally have very different personalities. Click the spoiler for a short description.
The visuals:
The game looks very beautiful, the girls are extremely hot. The scenes tend to accentuate the girls' mannerisms with small animations. The sex scenes have a lot of detail, and the animations are great. The only thing that I didn't like was the walking animations. Characters "slide" and it looks a bit clunky.
The sex:
As of v0.1.0 there are 3 sexual scenes. One of them is a full blown sex scene, while the others are a handjob and some foreplay that gets interrupted. I found the scenes a bit abrupt but they are very well made and for the most part they have a reason for being there, augmenting the setting by introducing an element of repression in the society.
The writing:
Way better than average. The story is interesting, the setting seems expansive, the dialogue is appropriate and engaging, even if a bit over-the-top at times. The dev seems to be italian, because the main script is written in italian, but the english are prefectly fine.
Some suggestions:
The game could use some more aggressive music. Currently it has a few mild ambient tracks but I don't think that they do the action/dialogue justice.
While the animations are great for the most part, used to make the scenes more lively and to introduce mannerisms to the characters. However, walking looks like sliding, which is very odd and distracting. To be honest I was surprised that the sex scene animations were so good as I assumed that movement was the dev's weak point.
While you've given the option for the MC to be more mild in his prejudices, some things he says are too offensive for no reason. It doesn't seem like they are important for how the scenes play out, but I think they create some confusion because the player assumes that there exists a possibility for a different outcome. For example when MC returns to base and speaks with Elara, he can leave a fairly good impression. Then during the health examination scene, he goes back into being an asshole, calling her a mutt and later he calls Irina a jester unprovoked. So all in all, it kind of "teaches" the player that the game is supposed to be played a certain way, which again isn't correct, because you can't get the Valentina scene without being a bit emotional/nice.
The verdict:
This game is already in my watchlist. I think from the very first release, the dev showed that he is to be taken seriously. There is a lot of great looking content here, a lot of emotions, good dialogue and an expansive setting that promises an epic story.
Best of luck to the dev.