I know that's why the screen comes up. I was just trying to say it's bugged out. Oh well.
News: 11 March 2016 - Forum Rules
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I can confirm that it now works fine with goomba color! Except for the screen that says "This romhack can only be played on a Gameboy color." (With goomba color set to GB Mode, it looks like a glitchy mess). Thanks for the update!
Edit: I just noticed that said issue about the GBC only screen is more than just a graphical bug. The game can actually be played with scrambled graphics on goomba color if the emulator is in GB mode instead of correctly showing the proper screen.