Shoot Many Robots
The title pretty much sums it up, but in case you need any convincing, it's a 4-player co-op run-and-gun action shooter that throws you into a tidal wave of degenerate robots with an arsenal of weapons that would make any mom proud. A classic 2.5D sidescrolling shooter revived with modern game design.
Story
You take control of P. Walter Tugnut (the "P" stands for "Pickles"), a regular guy who hoards guns, ammo and beer in his dilapidated RV, waiting for the inevitable robot apocalypse. When the abandoned factory in the distance starts producing robots on its own, Walter sets out in his RV to save humanity from the onslaught of robot hordes.