I played it at Pax. Played the multiplayer infinite waves mode. We were able to make it to the 8th round.
It's too bad, because I'm pro EDF and there was an "endless" points based tournament. The winner got 2200 points.
When I played I got 3010.
So, that kinda sucks, and the flying monsters are kinda shitty, they stay alive way way way too long. Hopefully it plays just like the original in the regular mode, with hundreds of weapons etc.
Also of note, blast radius doesn't kill you anymore. Awesome.