This is an excellent piece of erotic media. At least as of 0.5 though I wouldn't really call it a game... The only thing you do is to left-click or press space to show the next page. It's a visual novel right now, really.
EDIT: I just realized that this is literally advertised as a VN. I guess my blood hasn't quite returned to my head yet.
What's on those pages is EXCELLENT, though, can't stress that enough. High quality graphics, inventive monster design that gives homage while staying its own thing, a pair of absolute BOMBSHELLS as the lead.
The scenes inside Ava's mind are probably my favourites right now. Love Director Kato's design though and am looking forward to her getting more involved. The head scientist is extremely cute, too. Pretty much all the ladies are great.