Johnny Turbo's Arcade: Heavy Barrel

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

The unthinkable has happened. Terrorists have seized the underground control complex of a nuclear missile site. It’s up to you to infiltrate the installation and eliminate the leader of the terrorist forces.

It won’t be easy, powerful tanks, treacherous waterways, and defended bridges are all under enemy control now. The only weapon up to the task is called Heavy Barrel, but it’s been dismantled inside the installation itself. Your mission is to battle your way into the missile complex, secure and assemble the Heavy Barrel weapon and use it to defeat the terrorists.

A challenging arcade classic featuring run-and-gun gameplay and freedom to explore at your own pace
Takedown enemies with a variety of guns and grenades, all upgradeable with on-field pickups
Fight alongside a friend in two-player mode (requires at least one controller)
Collect keys from fallen enemies to unlock powerups and pieces of the ultimate weapon: Heavy Barrel
Play with original rendering or reproduce the look of an arcade cabinet with a CRT-style view