I completely understand. The way the colors work is that the fruits give the Level 0 slimes a strict color scheme, and then the Fuser takes the color values of both slimes involved, and combines them.
One of the things I had to cut out from the game was a ReColorer, which was specifically to change the hue of any slime. That is definitely going to be added in a future, more complex version of the game.
Thanks for playing!