This dev is the real deal.
This is not the deepest game around, but it still deserves the 5 stars for it's great quality of animations, and visual design in general. While I kind of favour the more cramped, but inventive level-design of his other game, Forest Of the Blue Skin, this is still a very professionally made, enjoyable side-scroller, with a bit of awkwardness.
The game has some of the best pixel-animation I've seen in an eroge, both for it's combat and it's lewd scenes. The quality and quantity of stuff here are both fantastic, and it really elevates the rest of the gameplay (or maybe, the rest of the gameplay fails a bit in comparison to the rest of the smoothness?) My biggest gripe is the fact that the game-uses "lewd on-touch"-grappling system for transitioning into animations, which feels awkward when fighting in melee, and not being clear on when the enemy is staggered. This causes combat to stop-and-start a lot, as breaking out of grapples is somewhat trivial at high levels. On the whole, though, the animation and move-systems both give the game a smooth feel, as you battle the monster-girls and dodge attacks.
The story and characters are slightly developed, but fairly bland. The expressive visuals do most of the storytelling, though there are a couple of scripted scenes with cg as well, for the loss-scenes on bosses.
The difficulty is kind of all-over the place, and the base-gameplay and character-building of the game could maybe have been done better. As it stands, every monster you sex, and every day that passes, makes your character stronger, permanently, meaning grinding and slowly recruiting every enemy you come accross will eventually lead to you becoming as strong as you can be, and stomping through the game. I almost feel that the game could have been improved if you had to... choose you builds, and have a limited ammount of stats you can buff up that takes less time, or if you had had a time-limit Some challenge-modes and some way to block auto-grapples would have allowed the game to stand more firmly on what's here. As it stands, the game is not enjoyable enough to play more of after completion.
Lastly, the game has a very good system for building affinity with your recruited monsters, where you can grind out both sex-level with a specific monster-type and relationship-points with a monster by... "grinding" on monsters. It's a neat system for enhancing the value of your monster-collecting.