I'll give you a 4/5 for the effort.
It was good for the most part. I liked the control bar at the top. That was a nice touch. But the voicework was kind of shoddy, and the character animations were somewhat sloppy. The flashbacks were also not very well defined as to where they began and ended, so it created some unnecessary confusion.
Also, when Mark gets his arm cut off, and he turns around, he's simply flipped horizontally, so his remaining arm effectively switches sides, remaining the farthest one from the camera.
Still, it was fairly funny, and you made a whole movie. I can't give this a low score because you clearly worked hard on it and didn't simply slap it together. So, for your hard work, I present you with a 4/5. Just work on those flaws for next time.