In first words, very big thanks for mGBA! I was asking You some years ago about GBA emulator and i'm happy that finally You made it!

But there are some problems with some games.

Some are graphically turned for about 45 degrees, e.g. Boulder Dash EX or have turned some parts of screen e.g. Bruce Lee: Return of Legend have turned background. Some have sound problems, e.g. both Metroids. Some have other bugs, e.g. Magical Vacation have glow effects not masked and it's big glowing squares instead glowing attacks or glowing during level up.

If You want i can test all my games which i have and give You complete list what's wrong in what games.