Gamma 19

Long after the fall of man, the rise of machines, and the end of robotic civilization, a new dawn approaches. The essence of a long-lost alien intelligence festers deep below the desert planet once known as earth. Feeding on organic life, this cosmic horror threatens to shatter the very fabric of interdimensional space. Fanatical robots of a dangerously erratic cult worship this being. One very confused human embarks on a quest to find the one that stole his arm, finding himself trapped in a conflict that will decide the fate of the multiverse.

Mechanics

Gamma 19 is an action RPG with beat 'em up battle mechanics.
Punch, shoot, and blow your way through the vile creatures that get in the way of you and sweet, sweet arm-based justice.
Upgrade your weapons and watch as they grow on their quest for supreme, ultimate power.
Oh yeah, don't forget Green Bean.