Reminds me of an improved version of Gauntlet - good variety of characters/playstyles and definitely more fun as co-op. I was impressed with the audio and art style, a real achievement for an indie. The narrator deserves a medal - great "narrator" voice! It's not a deep game, but a good and fun one.
I'm obviously late to the party, but man what a game! Sure the engine and graphics might be a little dated but the storyline and character development is fantastic - it's not just another run of the mill shooter, and what a fun shooter it still is! The ending.... outstanding and moving!!