A500 Mini users reported some issues with many Amiga games when using the WHDload function to import new games. It seems that the official WHDLoad package is extremely out of date, which is why you see black screens in a lot of games. Amiga Developer Amiberry released an improved WHDload file for A500 Mini users, the new database file offers improvements in compabiltity with many Amiga games and is easy to install.
news source: Reddit / download A500 mini fix