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My main quibble with the movie is that the attempt to fit Micah into the role of asshole boyfriend seemed very ham-handed to me. That concept is necessary for the film, but I think they would have been better off exercising just a touch more restraint in this area. [edited to add -- I can see where this may have been the result of the improvisational aspect you mention, come to think of it. If those asshole grooves would have been a little more well-worn and familiar, they probably wouldn't have felt so jarring]
The effects were interesting and well-done for the budget they had, but I couldn't stand the two main characters--especially the guy, who was just a douchebag the whole way through, to the point where I wish we saw him get stabbed at the end.
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