Based on V0.3.3
If you're going for an adult VN (Or in this case, a KN because no choices are available yet) your initial offering REALLY needs to wow your audience with one of the following:
Amazing visuals (To have something pretty to look at while fastclicking through the text).
A genuinely gripping story so that the audience really cares what happens to the people & the world they inhabit
Superb smut so that the audience can get their jollies regardless of the quality of the character models and writing.
UFO, unfortunately, fails to make a splash in any of those categories. It does nothing horribly wrong but as of V0.3.3 also does nothing -right- in such a way that makes it stand out from the hundreds of similar style games on this site.
This game does itself no favor by having very little content at all, as it offers, if you're generous or a very slow reader, a 15min demo in which nothing really happens. You get few pseudo-sex scenes, some uninspired loredumps and a story that has a lot of words but actually says very little.
As stated above, your demo NEEDS to wow your (potential) audience so that they stick around for your next updates, eager for more.
UFO unfortunately fails to decisively deliver at any of the earlier-mentioned points.
The character models aren't bad looking, but they're about as cookie-cutter as they go. So, there really isn't any spectacular eyecandy strutting around to keep my attention.
Storywise its premise is a smidge more interesting than the default generic current-day cookie-cutter seduction romp, but the story is 0% show, 100% tell. And what it tells isn't good.
Here I can pick out some actual things that made me cringe hard and lose interest.
MC is abducted by aliens. Aliens are given ONE line explaining they're now dead when the ship is boarded by the dolls. They're a literal plot vehicle to get the MC onto the ship then immediately get tossed into the nearest dumpster to make room for the main cast.
MC has ZERO lines of dialogue in which he is affected by either being a thousand years in the future or being told he's the last man alive. He's either brainwashed, brain-damaged, a cocktail of so many "-paths" that would make even social dumpsterfires like myself raise serious alarms, or possibly repressing so hard he's going to break apart in the next version.
MC just does things, never reflects on his actions, no motivations beyond "I want to do X because I want to." and fails to meaningfully interact with -anyone- at all. It's honestly really creepy and reinforces the idea that there's something genuinely WRONG with the MC's mental health.
If that's actually where the author wants to go though, then kudo's to them, but I haven't gotten the feeling anywhere else that this might turn dystopian horror in the next scene.
Smut-wise there's barely anything there. A smidgen of teasing and some boobs and you've honestly had it all.
There's zero gameplay, the only choice you're given is which name your character has. It's a Kinetic Novel that doesn't tell a good story.
All in all, I would rate it a 2.5/5, rounded down because there simply isn't much to judge yet either way. But on the whole this isn't really worth spending the 15min of clicking through yet. Too little happens, and what little does happen isn't memorable in a good or bad way.