First off; the game is a lot of fun. I have some issues here and there, and I'd be remiss not to inform anyone reading reviews about them. But this game is fun.
It does suffer from some weird stuff. Namely, there are two games. One where you take a jog and explore the city during the Day. The other where you gain stats and get better and better at molesting her at Night. The game is in development, so I'm not going to begrudge the fact that the jogging game is unfinished but...
First: The night game feels like a whole game. It's a fun one, too! There's a loop, stats that unlock skills that increase your money, money that you use to buy more stats and skills. Great work. Game is worth it for this alone.
Second: But the night game sort of doesn't really allow you to progress into anything penetrative until you not only max your stats, but you dip into the day game and get items that 'numb' her.
Third: You can't build your relationship (if you're a degenerate vanilla enjoyer such as myself) until you...max out your stats. So effectively, the relationship doesn't START until the Night game basically ENDS. - Note this is likely being fixed by tying it to a different upgrade system. It was a problem in the version I played. I will be coming back in a later version to see if this is still the case. However, my complaint that the game feels like an uninspired game sewed is still something I'd watch out for.
Fourth: It's hard to make real progress in the second game, where you explore, until...you max out your stats. It's not impossible or anything, but you really don't get very far. It increases your stamina which lets you record longer, but that's no different than the other stats you increase during the day.
So invariably, you WILL hit this awkward point where you're basically a time traveling molestation ninja (likely only technically not a virgin because you were able to get your dick wet for 3 seconds before she was about to wake up), and only then are you able to have a relationship with her.
And this might be intentional! You have the ability to, sort of, end the game whenever. So you could end the game after the ninja part and that could just be the game.
But if you're trying to get any further, you're playing the second game. Which very clearly isn't as polished.
The first game on its own is great. But I think you should be ready to hit a point where you're really about to stop playing it and start playing a new one.
Final note: I'm guessing a lot of this is known by more than just myself, looking at some change logs it seems they're actively trying to blend the two games together. This just makes the game better.