The nonstop action doesn't give anyone enough time to be anything but fully immersed in the story, and that's a good thing. Two jumps right into the premise -- two strangers in a strange room, sewn together at the abdomen -- and the viewer experiences what they experience in more or less real time. As such, there's no time to question the logic and logistics of how these two managed to get themselves in this (wait for it) sticky situation, and as the facts are slowly revealed, more time is spent anticipating what's next than getting in touch with one's inner skeptic. There's a deeper theme behind all of this as well, as alluded to in the title, and in a world where most people think that one infamous movie about people being sewn together is one movie too many, the mystery, suspense, and action in this particular sewn-together horror movie helps Two find its own space and originality.
If you can get past the premise itself, the only real problem is how pretentious it gets at the end. The artsy ending is more likely to induce groans rather than show everyone what this was really supposed to be about. It's too bad, because, otherwise, the acting, pacing, and story all work together to make this more than the standard splatter-filled grindhouse stupidity one might expect from a movie like this. It's surprisingly entertaining, especially so because it's set almost entirely in one room, and almost entirely centered on two characters with very limited freedom of movement. Also, at one hour and fifteen minutes, it's the perfect length to tell a story like this, and doesn't make the mistake so many other filmmakers make of padding the story with distracting and pointless side stories and redundant scenes that reestablish what the viewer should already know if they've been paying attention.