If you are familiar with the original Alien Swarm, then you can go to the sequel, essentially just for the sake of new campaigns, of which an unbearable amount has been added here.
In all other components, the game remained without any significant changes. Everything remains in its place - 4 operatives must make their way from point A to point B, simultaneously destroying everyone who might stand in their way, and at the same time trying not to throw off their fins themselves.
For those who missed the free cooperative shooter for four, I highly recommend checking it out. If you were already familiar with this series, and last time you wore it out completely, then you are unlikely to find anything new for yourself here.