Its not a harem game because the dev chooses not to, but so far it has absolutely been a game that has characters seemingly totally fine with sleeping around, with several partners, with no consequence so far. The only sex scenes in the game for the MC so far are with girls who have shown to be with other partners. It makes it feel like a forced thing because the dev wants it that way rather than what is acceptable in universe. It feels like with how the characters are acting it should be fine to be with more than one girl, but because the options for a split happen on the same screen we dont get to, just feels fake imo.It's just not an harem game. Like IRL, you choose a girl which interests you and this one you pursue, the others take a backseat. You may consider this approach a waste of dev time, but personally I find it pretty interesting and refreshing.
I'm fine with games that are either harem or not as long as it makes sense in world, to me this one does not at this point.