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This appears to be a dualboot title rather than strictly DMG.

Playing on GBC (or certain emulators) loads the green palette seen in these screenshots, disabling the ability to select palette via button combinations on startup.

Plays fine and am impressed by all of these ports. Just thought it was worth highlighting this quirk.

Thank you very much for your comment. On which emulator did you experience this?

A couple. OpenEmu on Mac (Gambatte core). KiGB standalone on Mac.

On the later you can toggle whether to emulate in GBC mode or not. When I turn it off I get the expected behaviour.