Battle Chess won’t run
Reducing the RAM give to the Mac to 16MB makes it launch, but that seems too low (even lowering it to 24 is not enough).
The Battle Chess documentation suggests changing to 24-bit addressing (which I guess is equivalent to giving 16MB RAM), but that setting doesn't seem to persist.
Adding support for using mini vMac as the emulation engine (#71) may help, it simulates an old enough Mac that 24-bit addressing should work.
I've now done enough of the Mini vMac/System 6 bringup to try this, and it seems to work (live at https://system6.app):