Traditionally, Asian films have been sticking more to the classic horror styles and elements. What I'm saying is that in general, they are deeper, more frightening, and overall much better than American horror films. But I found something odd about "Koma." It seemed to be a combination of a slasher film, a psychological horror film, and a family drama. True, this has worked before, in much better films such as "The Silence of the Lambs", but there is something different about "Koma." It almost seems as if the filmmakers wanted to make an "American slasher flick" rather than an "Asian horror film", and to be blunt, they found something in-between.
It is hard not to notice some American influence in the film. There are several shots ripped straight out of "Fight Club" and "The Evil Dead", and the musical score is taken directly from M. Night Shyamalan's "Signs" (Though it is a computerized version of the music, not the original studio recording), with only minimal original music.
But still, it manages to tell a rather absorbing (If not genre-confused) story about friendship, betrayal, and redemption, all revolving around the idea of kidney-theft. (Yum!) Unfortunately, the movie is only 88 minutes long, and all of the interesting ideas are condensed into lesser versions of what they could be. Perhaps if the movie was longer, and took more time to explore it's characters and stories, it would have been better. Hey, it might have even become a modern classic... But because of uneven direction (Zooming cameras and quick cutting in the beginning become long, steady shots as the movie progresses) and a compressed story, what we get is marginal.
Sure it is memorable, but that is only because of it's odd vagueness in what it wants to be, transforming it into a mish-mash "referential" horror film. Overall, even though it is only "pretty good", and there are much better films out there, but be sure to at least give this one a shot, you might like it.