Well...
It sounded like some messed up kids show up until they cut him open which the yelling sounded horrible for, I mean, imagine if you were being cut open, would you be slowly questioning their reasoning AFTER you were cut open then quietly yelling? (I know that last bit sounds contradicting, but I hoped I got my point across). At least your mic quality was good and the idea was good, but just poorly played out. Also, please work on more detail in not only your characters, but the background as well, there wasn't much to look at.
It wasn't that bad for a first flash though, just figure out how to make a preloader too.
Hope this review was helpful for you.