Gun Monkeys

Gun Monkeys is a multiplayer shooter video game with side-scrolling gameplay, developed and published by Size Five Games. It was initially released on June 28, 2013, for Windows and OS X on the Steam platform. However, it was later taken down from sale on Steam.
The game is set in dynamic arenas, where gun-wielding monkeys battle against each other. Players take on the role of these monkeys and engage in intense matches. The primary objective is to collect "energy cubes" scattered throughout the arena and bring them back to their respective bases. Each time a player is defeated, their energy is reduced by one unit. The game continues until one player's energy reaches zero, resulting in their defeat.
Gun Monkeys offers procedurally generated arenas that provide diverse and challenging environments for the battles. These arenas also feature various environmental hazards, adding an extra layer of excitement and strategy to the gameplay. Players have the option to engage in matches locally with friends or compete against others online.
An in-game currency system allows players to earn cash while playing online matches. This earned cash can be used to unlock and acquire different perks, providing players with various advantages and customization options for their monkeys.