Well, don't expect a great story.
The art is great (as always with Kagurado's games), the same for the H-Scenes. Surprisingly the game has a lot of different OSTs, one for each elf girl?
Talking about the female characters, well you will find at least one that you fits your taste, after all this game has it all: chubby with low self-esteem, loli, ara ara onee-san, imouto, loli baba, tsundere, kuudere....etc etc.
The puzzles are... ok? Well they were "fun" for me but I have some problems:
1- It is very limited. After the elements presented on the first 3-4 levels, there is nothing else. What you did on those levels, is what you are gonna do for the rest of the game.
2- Well yeah, what I mentioned on the first point wouldn't be an issue, after all there is no reason to make something over complicated, simplicity is great too. But the real issue is that the game is too long. after going through +40 floors of the same thing, it gets fucking boring. It would have been better to make one difficult floor for each girl, instead of so many floors of the same thing.
3- Now talking about difficulty, I don't know if I am the only one who felt like this while playing, but the puzzle difficult felt random at times. I could get stuck for example, in floor 31, and then just breeze through +10 floors until I once again get stuck in another. The puzzles difficult didn't escalated the more you climbed the tower, it felt more like a roller coaster. Dunno if it was just me being dumb as fuck at times, not being able to see the simple solution.
Overall it is...meh, not trash but not great either.