About NRABrazils method:
first you can reduce the colors of the images, instead of full color, you can try monocolor or posterized, but do not forget to change the image setting, this can reduce a lot of image size.
Would that really work in c2? I thought all graphics were formatted the same way on import, leaving you with height and width as only "tools". -Ie a monocolour sprite is still read as full colour by construct.
Can someone clarify? Difference between cc & c2?