G&W Balloon Fight (new wide screen) has now been preserved in MAME
Thanks to JD for kindly providing the game!
The game is using the SM511 and is actually sharing the exact same PCB layout as Climber (new wide screen). The melody ROM has been extracted electronically and is not certain to be 100% accurate.
This is a screenshot from the game:
Hydef, working at almost the speed of light, has already created amazing artwork for the game: