So since it's Valentine's Day and I have nothing better to do, I am going to write a review for Huniepop, which I just finished earlier today.
Overall it's a pretty fun game, with puzzles that get more challenging with each date (regardless of which order you do them in, for instance you can have maxed out one girl but the first date for another will still be harder). These puzzles feel very reminiscent of mobile games like Candy Crush, but since I haven't played those I'm not sure how similar it is. This could very well be another Puyo Puyo/Dr. Robotnik's Mean Bean Machine situation where it's copy & pasted from another game, and I wouldn't know. I can say however that my experience with these mechanics was pretty enjoyable.
I liked how you could invest in certain stats to make the puzzles easier by spending time with a girl. This visual novel side of the game certainly has its charm, but wears thin pretty quickly. After your initial introductions it ultimately amounts to asking questions about them, remembering what you've already asked, and remembering the answers to those questions (aka checking her profile every time you talk to her) and eventually you will reach the point where you're just doing it for the resources so you can make your next puzzle easier.
Speaking of resources, there are also date gifts that you can receive from giving the right items to a girl. What you receive, however, is completely random. I kinda hated that because there was a specific one I started to really want towards the end but could never seem to get. What these do is very important though, as they're arguably more useful than the stats you level up. You can have up to six with you on any given date, and they let you manipulate the board in a number of ways, like turning one type of token into another, giving you more moves, making a certain type appear more often, etc. These are great, but I wish there was a way you could choose which ones you wanted to buy instead of having them be random, especially when you have a limited inventory meaning that you can receive date gifts you've already thrown out to make room for items you'll actually use.
It probably goes without saying but this game is best enjoyed if you're in a horny mood already. Going through and maxing out some of the girls I wasn't as interested in was probably the most boring this game got for me, so try not to let it feel like a chore. Just go in with the right mood and a lighthearted mindset to best enjoy the often silly dialogue, the puzzles, and most importantly your "prize" for completing them.