Well, as you've said. It's the usual Harem cliche trope, so really nothing to review in terms of creativity.
The story starts off like any other harem story, I would have to read a lot more to get invested.
The story is also very slow. It could be a lot faster, but that gives you time to get into worldbuilding and character motivations, no?
Overall, a good start, pretty standard. Nothing out of the ordinary, and that's fine.