I finished my project today and have done some moderately rigorous playtesting. The resulting ROM plays in Mednafen and LibRetro as a Gameboy Color game. I've been unable to run it with original Gameboy emulation or on Firefox/Chrome. Any advice would be appreciated, but aside from that my project will be submitted soon!

GB Studio is great, BTW!

I know that VBA has an option for emulating the original Gameboy, if that's what you're asking. There's a checkbox in one of the menus. 

I was able to embed the game on itch.io pretty easily once I figured it out. My submission is now available to play in-browser on the project page!