thinking about games that were runable on A500, it might be: 'Zeewolf' or '4D Sports Driving'
PS.
you need 24-bit pallete even for A500 games if you want exact same colors! I tested it with 'screengrab' software on real Amiga and UAE. That is the only way to get 1:1 snapshots.. (you can reduce palette afterwards if for eg. only 32 colors were used, of course before saving as .png/.gif)
