I researched a bit, and i got all the orbs.
Orange: increases radius
yellow: Main orb. The only orb that can be moved.
Blue: atleast one has to be connected in a line that will touch the white one.
White: Required steps to finish the levels.
Red: If yellow orb connects to it and connects to white/line that connects White you cant finish the level.
Green: if connected to red Disables red. Pink: Every pink orb must be connected with yellow to finish the level.
Thats all! Cya!