Pretty Neat
There's no need to explain the characters are mushrooms in your Author's Comments since they're very well drawn which makes what they are obvious. I dig the overall style and the use of mushrooms as main characters! This looks like it's going to be pretty good!
My only nitpicks are 1) the music in the beginning just cuts out - it should either fade or segue into the next piece; 2) the introduction of the Conan-type shroom slows down the trailer and 3) the muzzle flashes on the guns should be larger (as in the scene just before SD comes running across).
Overall, this was a good toon and I look forward to checking out the series! Keep Flashing!