I think you'll find the low level disk code only works with FFS.
Also it came to mind this morning...
This game runs SetPatch on boot from Floppy Disk via the Startup-Sequence. If you notice some sluggish behaviour when lauching the game via your own Workbench and not direct from Floppy Disk, then you may need to run SetPatch on your system first.
I stuck that notice on the AGA Digital Download versions too anyway just in case.
Wiz Gold+ release works fine on my setup here which is A1200 020 / CF Card ADH2: / FFS / SetPatch <enabled>
https://www.instagram.com/p/CIBWR9UJ3Nu/
Also the CD32 controller buttons work in tandem with regular joystick all OK.
https://www.instagram.com/p/CIBWznvpXHl/
Same with Tin Toy AGA without WHDLoad for the record, as it uses the indentical RNC dosio disk loader.
Also remember Wiz trashes the Amiga OS on boot and is not system friendly. It takes over the machine plus the 2Mb of chipmem on boot after relocating itself. It then uses low level disk functions via RNC dosio to read your drives.
WHDLoad version is coming anyway so either way it will be covered I guess, tho personally I don't require that on my machine here to run the game as you can see in the videos.
Have fun!
Adrian