the game is good, but is missing certains like a harem ending/multiple ending which it FEELS like it should have
Let me know if there are, but I've looked pretty hard unless the Chapter 7 requirement of Lily at S rank affection changes
But i don't think it does
I disagree that it 'should' have a harem ending. I mean, I have nothing against harem routes themselves, but it would be very unexpected for this particular genre, since it is all about living under one roof with the heroine.
Many VNs have the premise of living together with a group of girls for various reasons, from the mundane (they're all your sisters/cousins/whatever) to the ridiculously far fetched (you inherited the position of manager of a female-only dorm from your grandmother and have to cross-dress to keep the position), so taking one of those premises and building a game in this style could be a way to take this genre and make it harem-friendly, but I haven't seen any game that did things like that so far.
Here, the devs clearly started from the idea of having one main heroine, just like in their previous title (1room) so I think it would be unlikely to change direction now. It would be interesting if the developers decided to go in that direction, but it is interesting for the exact same reason that it is unlikely: to my knowledge, no other game in this style had even a two-girl / threesome route, much less a full harem one.
To stay true to the genre, any additional girls would have to move in with you and Lily, and be integrated into the daily routine of the tavern and the main couple well before the ending proper, which could be challenging not just in terms of story but also in terms of game mechanics.
That would take a lot of work. Just drawing some static scenes for a harem ending would be simple enough but at that point its basically sticking a VN section at the tail end of a simulation game which would be just unsatisfying.