Thunder Gun: Revenge of the Mutants

You have a gun that shoots lightning, goddamnit; with it, you will defend Earth against formidable mutant enemies until rainstorms render it inoperable, forcing you to use conventional weapons until the skies clear. With loads of unlockable costumes, perks, and characters, Thunder Gun: Revenge of the Mutants will keep you playing for hours while you master its insane difficulty, comboing, chaining, and rocket-jumping.