So I downloaded the Deluxe Galaga from Aminet (the ECS version) and installed it on my A2000. When I try to run it I get a yellow text screen surrounded by a flashing yellow boarder saying "File missing" in game directory . Can someone try it and see if they get the same result and what might be missing?
Is your A2000 ECS or OCS? If it's OCS then it must have been called Galaga ECS because it requires the ECS chipset and perhaps this is the reason it's not working for you.