Help running Jang Pung II (GG)

[Ninjinister]

Hey folks,
I was trying to run the original, unadultered Jang Pung II (no sprite edits, original title screen, .gg file as opposed to the .sms conversion) but the colors come out looking... messy.
I read that this is a result of the Game Gear game running in Master System mode. However, I'm not sure how to get any of my emulations (Meka, Kega Fusion) to run that compatibility.

Is there a way to still run this and preserve the original presentation of the game as-is?

Thanks!