10 love interests without harem being planned is unrealistic for a first release.
Not really considering there are only 4 main girls and the other 6 are side girls Its actually less than other games like Being a DIK or Intertwined have plus everyone knows that non harem games need side girls for the sex scenes while main paths develop.
The bulk of the game content will be the main girls and their routes while side girls will be more for sex scenes and their paths will be much smaller in scope, that's why if you noticed the only sex scenes in the prologue where with side girls because that's pretty much what they are there for while the mains get some development and get to that point later in the story where sex with them feels more natural and less forced/rushed.
The dev already stated on discord that the game is non harem and that he has no interest or desire to make a harem game, he said maybe one of the routes will have a throuple but that's a big maybe and its not set in stone.