A very neat sample of what's to come
You being a fan of the game, you obviously you put more effort in the L4D animation bit. It was well done.
Let's see if you can incorporate some impressive voice acting later on.
A decent recording mike shouldn't be too expensive.
For a first flash, it is rather impressive!
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-it was a bit short and lacking in sound
-it wasn't so much focused on movement animation.
+the lip-syncing was pretty much on cue
+impressive use of colors
+your artistic abilities really show through