Okay, I'm stumped. How do you do the Activision thing and vary the colors of your players line by line? I keep messing with the interface, but all I'm getting is a rather severe-looking red.
v0.50.16: Add music editor, object distance blocks, color pickers, ROM bank breakdown, and fix various bugs. » Comments
That's planned to be implemented in the future, and will require modifications to the sprite editor:
https://github.com/haroldo-ok/vcs-game-maker/issues/166
For now, it's already working on the background editor, and to activate it, you have to activate the "Enable per-row playfield colors (pfcolors)" switch on the "Options" screen.