I have the same issue but unfortunatley, even if I reduce the colours and put on low res, the game still crashes back to Workbnech after a split second. Pity. I really wanted to play.
Are you using emulation? Try just booting the workbench disk and playing from there.
I've fixed it by not having to change me screen mode. Just open CLI and boot it from there, rather than navigate through windows. I'm not emulating.
