Harem Hotel has and always will be primarily an adult visual novel. The other major themes are of course dating, and training. All the characters in the hotel are broken, so you can definitely expect psychological problems to be addressed. And yes, most certainly their struggles.
Harem Hotel's story however isn't here to make you depressed. The story won't have a bad ending.
No pain, no gain? Yes, I understand that in the novel you can't do without the growth and disclosure of the characters. So far in the game, it happens perfectly. It's just that there's so much bullshit in life, so in games you want less psychedelics, more love. In your game, I repeat, so far everything is fine.