In ORBS, the goal is to not lose the orbs in the lava. Simply click in the orbs to collect them, but be careful! There are more orbs as the game progresses, and you lose 10 orbs when one one falls in the lava! (I know it makes no sense but if it wasn't like that you'd never lose).
This game is in beta, many things are going to change. Please report any bugs in the comments.