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@cacophony555: Thanks for mentioning that alternate command for mame4all

COMMAND = /home/pi/RetroPie/emulators/mame4all-pi/mame %BASENAME%

Once I added that to my es_systems.cfg, Galaga ran flawlessly. I did lose my joystick controls and when trying to map them, mame did not recogize my wireless PS3 controller. But I will try and work through that next.