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Rocks! I'll be surprised if this doesn't get the daily feature. Here's some suggestions for an already fine animation:
(1) more background sounds
(2) tidy up some messy bits, like when the guy shoots into the trench it looks a dumb, and so do some of the explosions etc.
(3) background screen for the word skirmish, looks a bit silly (white lines?)
(4) this is getting silly, but more camera angles and close ups (well, it's just really good so I'd like to see it improved)