This is the only version of this game that I've played, so as someone new coming in without comparing it to previous versions, here's a review of it.
The plot, characters, and music: all fine. Not great, but fine.
The art: Mostly very good, great even, but I do have a couple complaints. First is simply, in a couple of the animated sex scenes, there is some awkwardness with the layers and positioning of stuff. The scene with the snake and scorpion girls in particular comes to mind; I can't figure out what the heck the scorpion girl is supposed to be doing to the snake girl, the positioning of their bodies relative to each other is nonsensical. Second is more of a complaint about style; why do so many things that supposedly focus on "monster girls" seem to half-ass their designs until they look indistinguishable from humans in silly costumes?
The gameplay: Starts out great, especially for a porn game, buuut... the balance quickly falls apart almost as soon as the desert is reached. You gain a level every 1-2 battles, each of which gives at least one point to every stat, in a battle system where every additional point in a stat matters, in an area with a lot of battles, where there are only 4 varieties of enemies all of which are roughly equivalent in power. With minimal grinding (all I really did was, do the fourth forest area one and a half extra times for the bear girl shards needed to get all their scenes), by the fourth desert area all the battles were basically free (nothing could really hurt any of my characters), and all kinda the same. It was boring. And after all that, I STILL didn't have enough scorpion girl or snake girl shards to fully unlock both of their scenes.
There are a lot of ways to fix the game balance, but my personal suggestion is: Increase the rate of exp-to-next-level growth so you level slower after a certain point, either decrease the number of shards needed to fully unlock scenes or increase the drop rates for rarer monsters, increase the number of crafting components received from chests (and maybe decrease the gold you receive from battles). Also, maybe decrease the number of battles in the desert just slightly (about 1 to 3 fewer battles in each map), but make the everything but the cheetah girls a bit tougher (small stat boost for fennec foxes and scorpion girls, large increase in damage of their damage over time moves, larger stat boost for snake girls, particularly to their health).