This game is okay. It's not the best, but I am sure that it is not a waste of time.
Gameplay:
+ Combat-wise, it is exactly like Wings of Roldia, Panacea Z and it's dev other game. Basically, the you hit the attack button to attack enemy on the map, no turn-based combat dialogue pop-up. On the other hand, since your attack can knock back the enemy, you can just spam and lock it in a wall or corner, making combat very easy.
+ The other aspect of the game is puzzle solving. It is not hard either. But the screen is dimly lit and no map, which make navigating through the stage is hard and tedious. Fortunately, their are strong enemies in the stage that drop keys to shortcut. Just buy the best weapon and you can just kill it to move to next stage.
Art:
+ Animation is a big plus. The detail to genital is great to.
+ Gorgeous character design. My favorite is the mage and the (soon-to-be-defiled) Holy Maiden.
+ The sex scene is animated, however, it get reused really fast. I mean, every character have exact same animation and posture for missionary, doggy, ...
+ Stuck in the wall, swallowed girls by mimic, one scene tentacle, ...
+ I think 5GB is a decent price to pay for smooth animation . Oh I forget to mention that the animation is smooth, despite my potato computer struggle to play animation from Succubus Academia.
Story:
+ Weak story, unless you go for the true ending. This kind of game does not benefit from a good story either. I don't particularly fond of hearing someone story before raping their corpse
Conclusion: Good game. At least I enjoy it for a day or two (7-8hs)