What if my background is white and all of the characters/objects are black, but with different opacity, is this allowed?
Hi there! I hope it's okay if I chime in real fast~
I do believe it's okay to change opacity because in the rules at the bottom of the overview its says:
" *5 - if there are only two colors in the game(black and white or their analogues), [...] (The same color with different alpha channels is not considered separate colors.)"
I hope this helps :D