There weren't many games of this kind that impressed me because of several factors: a plot that is overused, characters that are overused, models that are overused, poor gameplay, poor story, poor writing and poor pretty much everything except that the premise of sex and sometimes graphics. It's a reason why I normally just play Japanese RPGM games these days because the Ren'Py made ones just aren't worth the time.
Thankfully, this was not the case with Long Live the Princess. TBH I chalked this game as another one of those games (seriously, there are so many) that is a either a complete waste of time or an absolute grindfest at first. That is not the case with LLtP. It is a puzzle-like game where you match clues for rewards. Grind do not exist in this game that is not how the system is set up. I do imagine that people will have to forego certain scenes due to time limitation that will probably be implemented once the game reaches the Princess' part - hence giving it replayability and non-linearity - but since you can carry some of your stats forward in a New Game+ that shouldn't be a problem.
The writing itself is simply outstanding. This is probably the game with the most fluent and grammatically correct English I've encountered on this site. The story is intriguing, the characters are actually believable (sounds odd until you've had the misfortune to try out shit like Lida's Adventure) AND cool, and the scenes aren't actually stuff that has been rehashed in a different package a million goddam times like yoga.
Also, sleep molestation scenes. Like, wow, I can only remember one such game that scratched that itch of mine properly that I can't even remember the title now, and this one practically has an entire section of the gameplay dedicated to it. Now if I can rub all over Primrose like in Hack n Stalk 2 then it'll be f*cking perfect (Please don't I'm only daydreaming daydreams = usually terrible in real life).
If there is one flaw in the game it'll be the story barely progressed at all, but I also noticed that it's structured in stages so when there IS a story release, a sizable chunk would probably be released together, which is super awesome.
All in all great job dev. My recommendation weighs next to nothing, but you get 5 stars and a glowing review from me nonetheless!