Thanks for your reply.
I tried the ECS version, I set it up on my A600GS as A500Plus 1MB chip 1MB fast and it runs at correct speed, but still somewhat buggy. Still quite playable though, and I know I'll play it when I have my GS on (I have always loved this game).
Pity it won't run 100% correctly on my A600GS though, and as I said, other games from your collection work, I have tried Pheonix and Moon Patrol both in AGA mode and they run 100% perfect on the GS.