Mixed Feelings
I like Left 4 Dead, and it's cool to see a parody of it, but this was of lower quality that I expected.
First of all, the drawings in this were not Egoraptor style. The big eyes and squiggly brush strokes is reminiscent, but too generic to warrant such an accusation.
What IS reminiscent of Egoraptor is the pacing of the short, but again, does not warrant cries of stealing. However, you also made a Grand Theft Awesome, so to assume you were not inspired by Egoraptor at all this time around is easily just as silly as assuming you did rip him off.
Now, about the actual animation. The Witch and Hunter bits were amusing, and so was the end, but that really was it. It's not that there were no jokes being thrown left and right, but the parts that WERE jokes I didn't really laugh at, such as the Boomer, Smoker, car, and butt-shooing scenes. Boomer scene had potential, but was not executed well (again, pacing). The smoker licking Louis' crotch was bland to me, especially the "hell no" line. Car scene, kind of generic bumrush of enemies. And the butt shooting part was just not my taste I guess, because since it is so random, I could see people finding that funny.
I am black and was not offended by your portrayal of Louis. To those who cry out to this, I appreciate your sensitivity, but damn this was drenched in satire, no need to get hissy fits. BUT, at the same time, you, the author, should not assume people know about online players making fun of Louis. Esoteric inside jokes like that do not work very well. You should have known people who do not play the game would think you are just using a stereotypical black person, who acts nothing like Louis.
The voice acting was decent, minus Louis's. Drawings got the job done (nice attention to background too). But, you combined real voice actors with actual audio from the game. That was kind of weird, hearing a high-pitched male voice as Zoey and then have her screaming audio from the game. Choose one or the other next time.
But there just is not enough substance to this. I do not know why you rushed it if there was no deadline. And selling a shirt for this is out of taste in my opinion. And yet, the score is ridiculously high with over 100k views. Take a video game, create a couple of wacky scenarios, and draw gets someone this high of score and attention? But this is not your fault. I completely understand and relate when it comes to making cartoon/jokes because you enjoy it and it's for fun, not solely for popularity (but selling the shirt could make people think otherwise).
Supah Nin10doh! is a gem in the video game parody trend, so I am not anti-VG parody. But you could have been a lot more clever with this. It looks like you took some isolated things you thought were funny, spliced them together, and animated it. Nothing evil about that, but that means the score will suffer (er, well, from me). I suggest make the pacing more coherent, make less inside jokes, make the "plot" less chopped up.