Belmont, Idol, Dragonlor, and I have been playing this. We've been working our way through the campaign every so often, finally finished it up today. Tons of fun, when you have 4 dudes playing its so much more enjoyable than just 2 or 3. The weapons become more useful, someone can use the tesla cannon to slow the aliens down while the others mop them up, theres some really good coop strategy here. I'm surprised this was released for free, they could have easily sold this for $10 or $15 and it still would be worth it.