I have 512KB + an A501 Trapdoor expansion giving me a total of 1MB of ram. It might be slow ram, but I'm unsure.
The floppy I have is the 0.5MB version.
Note: I do own an original floppy from eBay, but that disk was corrupt, so I downloaded a version off the internet, but I was having issues with not being able to press the fire button on any of my controllers. I'm able to play with Amiga Forever with no problems, but not on my physical A500 (I can press fire and continue playing on Amiga Forever, but not on my A500). When I edit the game settings on Amiga Forever, I see it auto configured for 512k slow ram.
Edit: Added stuff.