I've already participated in the survey @ the end of the game, but I have to say I did enjoy the story. The few grammatical errors I saw did not break immersion too much, and the Dev stated that he already saw some while reviewing the game, so I'm not going to worry about it. That being said, I've seen much, much worse.
Story is engaging, art is good, and the mini games were not to terribly challenging.
It was nice to know going into the first fight that the Breasts were the weak point, and I lost the 2nd battle once because I made her cum too soon. Easily corrected in the do-over fight. (That was well done, btw.) I tend to save before going into new areas just in case of bugs or in case I accidentally skip over text. (As I did in the Mayuri scene).
RPG game, go everywhere, talk to everyone. The Arrow would make it easier, but as a rule, talk to everyone, and if the door is open, go in and explore, just have a save ready!