Looks great
It is hard to judge a preview, especially a preview for a game as you are not doing anything. Well, this was kind of an interactive trailer as you were able to advance onto the other side of the screen. This looks to be more of the same, only even better. Most sequels try to top what the previous one did by adding more stuff. That sometimes doesn't work for movies, but it definitley works for Newgrounds games! I am going to assume that this simply goes on forever as that is what it seems.
The coolest thing about this is probably how you are going to be able to send your own men out. It probably would have been a little better if you had shown the instructions, but still a great trailer. Actually, it is not really a trailer as I believe it is different every time you play it. The colors are done really well and all of the monsters are very well designed. Let us hope that this is the best game in the series yet!