I tested the game on a real A1200, both hard disk and floppy, and the top-scores are saved. I did the same thing emulating an A1200 (with FS-UAE), also hard disk and floppy (.adf file), and the scores are saved. I also tested it emulating a basic A500 directly to the .adf file, and the scores are also saved.
Can you tell me if you're playing on a real or emulated machine? If so, which emulator are you using?
Anyway, thanks for the compliments and support.