Flashpoint is a preservation project, and isn't really applicable to games that are still officially available and receiving updates, like MaD2, as it doesn't support developers in any way.
The up arrow has no purpose, you have to press Z to shoot... the controls are listed in the instructions.
But thanks anyway, you reminded me that I probably have to write them on screen, maybe on the first level
Flashpoint is a preservation project, and isn't really applicable to games that are still officially available and receiving updates, like MaD2, as it doesn't support developers in any way.