This is like a meal starting at the dessert. The premise is interesting but the author didn't really want to bother making people care about a story without the twist. It could've been much better paced had it used the traditional isekai protagonist rather than some weird ghost who instantly convinces a kid to destroy the world. Build up the world, who the protagonist is, how the heroines are, and so on. The initial arc doesn't even need to be dramatically long, just enough to make the betrayal parts hurt. Hint early on at the beginning whats to happen, just a drip feed, make it so the protagonist is reasonably sold on becoming hitler-judas for a timeline to save the world, and make people understand (and ideally fear) the heroines.
I'd have simply done an even more drip feed opening to get people locked in, follow up with a normal arc where along with OP heroines they pretty much complete stomp the demon king in like 6-10 chapters but are sent into a loop at the end. He tries a dozen or so times, pairs off with each, even soloing at one point, pairing with random side characters, even goes on a buddy cop arc with a traveling merchant bro; gradually turn up the frustration each chapter attempt. Another 20-30 chapters, where the solution is gradually fed over each loop. Then he finally has an epiphany, or perhaps has gone utterly insane: destroy the world to break the curse, and then fulfill your duty.
All this just so when the dumb game UI panel is like "oh yeah dawg they remember lol" you know that he is going to have to jump out that fucking window 2 seconds ago. From there its a collection of "oh shit" moments, where he really is more or less surviving while trying to kill the demon king. Vaguely vibes of a rogue spy movie plot ideally.