First, Smee is one of the few companies I've never bothered with in the past. There were a number of reasons, but it all came down to one issue in the end... I don't like VNs where you name the protagonist. Naming the protagonist inevitably means the protagonist is a shallow cipher/non-person whose personality and characterization can be changed to fit which heroine he is with. As such, I tend to avoid games where it is possible to do so.
HaremKingdom was an exception for two reasons... one, I like harem games... and the second reason is that I love isekai (no matter how bad it is). In this case, the protagonist is summoned to a kingdom in another world, where he is informed that he is the last member of the royal family and has to form a harem or he'll die. Now, this 'sex under the necessity' (once a vndb tag, don't know if it still is) setting would normally have put me off... but instead of jumping on it, the protagonist is scared to death of the idea (he has trouble talking to women). This kept my interest past the point where I usually would have dropped the game... and I'm glad it did.
The major draws of this game are the unrelenting humor (it is a constant rain of jokes of various sorts, though usually dirty), mild romance, and the H, which is frequently hot. The heroines are varied (the cool and collected Premier of the kingdom, Marue; the shy and defensive slave girl, Kiki; the manipulative merchant noble's daughter, Charlotte; the innocent but mischievous princess Sophia; and the osananajimi who knows everything about the protagonist, Hikari) and interesting enough to wet the appetite of your average harem-loving otaku, and they actually manage to grow to a degree after getting close to the protagonist.
The game's main peculiarity is how it handles routes... instead of having pure heroine routes, you instead choose what type of harem you want to create (each has a heroine who suggested it and serves as the primary for the path) and things proceed from there.
This is where the typical 'personality alteration' of a nameable protagonist comes in... but it is oddly not harmful in this case, since pretense at storytelling is fairly limited here. Yes, there is a bit of story to tell, but it isn't that important. What stands out more is the sheer hilarity of what I experienced in the two paths I went through. For the first time in a while, I couldn't restrain my need to laugh hysterically until tears and snot were running down my face... and that alone is a good enough reason to play this game... or at least, that is how I feel.