good, but you can improve
The animations were good, graphics also well made. Her facial expression was also really good I think, congratulations on that! The general idea is also pretty good. Even if this looks like that other game (Demon Girl), I don't think that's bad in any way: brilliant minds usually think alike.
I also have in mind that this is just a trial version, but this does seem a little bit limited though. I mean, the suggestions I can initially give here seem pretty obvious: more levels, more monsters, more attacks (just kicking gets boring after a while).
Here, not so obvious: the sex scenes were OK, however, I think you could improve a lot more. Different positions, according to the way the monsters grab you, would actually be great. Also, keeping in mind that this is a ninja girl escaping from somewhere, I'd say that those monsters were waaay too "gentle" with her. Not to mention that, while one is banging her, the others just pass by (?) instead of joining the party...
I'm not saying to create hardcore porn, but it felt a little bit too childish for a Mature game, considering your initial idea.
Well, I hope that contributes for something :) keep up the good work!