This game is great! I especially loved the combos you could get in the game. I'm also glad that you have options for taking out enemies. I was able to take out all but the last four enemies using only a knife, which is great because it means that you don't have to constantly swap out weapons while in combat.
The only problem, however, was that the game seem to have problems with performance. Suprisingly enough, turning the quality DOWN seemed to cause the most problems. I was frequently getting lag when I turned all options to their lowest setting. Aside from that, the game ran relatively smooth on default, and there didn't seem to be any other flaws or problems.
P.S: for some reason, I wasn't actually able to unlock the last two achievements, despite me surpassing them a couple of times. I don't blame this on the game, however: It could be my browser, or me doing something wrong. Again, great game!