I was surfing through deals.woot and saw this. Looks like a modernized Alien Syndrome with multiplayer.
Woot link:
http://deals.woot.com/deals/details/6e3a1717-bac1-4c50-9329-41551a9feaf1/alien-swarm-on-steam-free#4
Steam link:
http://store.steampowered.com/app/630/
Woot link:
http://deals.woot.com/deals/details/6e3a1717-bac1-4c50-9329-41551a9feaf1/alien-swarm-on-steam-free#4
Steam link:
http://store.steampowered.com/app/630/