Pretty good but can be improved
Pretty good DOOM flash movie although I do have suggestions
1. During the scene where the marine fights the Mancubus and saws it in half, you could have used the original death scene from the game seeing as in the game it also splits in half (and a pretty cool way to)
2. When the Marine jumped out of the river (cool way of bringing in some mythology there to) and landed you could have instead had the camera pointing at his back when he hit the ground and have him crouch down(you know like in the movies when the main charectar land from a high jump they hit the ground crouching. I dunno why but it just seems cool when they do it lol). Incase you didnt know yes there are sprite images of the marine crouching, all you need is the actual game, a source port (zdoom is best for this) and your set.
3.Spider Mastermind fight needs to be longer and it can't be killed so easy (get the marine a bit blasted from the gunfire and stuff makes it more dramtic)
Other then that this was pretty impressive and cause of it I made up my mind to start making flash movies on DOOM so great job. Oh yea apparently a friend from online DOOM apparently actually did a part of this movie (according to him he was the narrator). Do you mind telling me if this is true or not cause I wanna rub it in his face if it aint lol. All I know is his online name which is Sid Armas.