Oh man I really feel for you, I ended up discovering the demo about a month before the final release, instantly got sucked in/immersed into the world and was really hype and checking in every day to see when word of the final release was, but I still have it easy in comparison to those who were beta testers, kickstarter/patreon backers who waited so much longer (and had a higher level of emotional attachment.)
That's not nuts, I can totally see why you feel that way - at times it DOES feel like the game is actively trying to punish you, especially when it comes to initiating any kind of intimacy. Flirting is fine, but as soon as anything physical gets involved it seems to cross a line in the sand that the game wants to punish you for. You know that one common ending where Lazarus kills you, and while you're dying he begins taunting you that he won't even eat you because you might enjoy it? That's how it feels the devs went about implementing the sex scenes - they'll give them to you (due to fan demand) but in return, they'll make sure neither the characters, or the person playing can enjoy it (in good conscience.)
Then to top it all off with the "true" unlockable ending being some vague meta message about how nothing you did really mattered? Like, how did they think that was going to be received by their fanbase? It's the literary equivalent to suddenly dunking a freezing cold bucket of water all over your audience's head after they've poured their time, money and effort into playing your product. I fail to see the message they were going for, other than punishing their players for wanting mutually consensual sex and a semi-healthy relationship out of a dating sim game.