Don't judge by lack of sound alone
Okay, I'm going to admit right now that I am kind of frustrated by how this doesn't have any sound. It seems like you could simply place a popular high paced song over it to have more people enjoy it. I still found this to be enjoyable because the animation is actually really good in this. What's also funny is the random appearance by Gordon Freeman not as a stick figure. I guess the lack of sound makes it hard for you to figure out the story. It's still fun to watch.
I think my favorite would probably be the stick figures who have the white masks. Apart from said masks, they have the coolest weapons. Freeman looks great as a stick figure in this. The animation moves quite fluidly and gives off a nice sense of action. You really don't know what to expect from the random location of New Mexico in the beginning.