Revamp Adobe Air Game Graphics

I need the visual side of an existing Adobe AIR desktop game refreshed. The codebase itself must remain untouched because I no longer have the original source files—I just want the compiled build re-skinned... (Budget: $250 - $750 USD, Jobs: Adobe Air, Adobe Creative Cloud, Adobe Photoshop, Game Design, Graphic Design, Illustrator, Photoshop, User Interface / IA)