If you go for the blue triangles, you get 10,000 points. The purple diamonds are 5000 points. The orange circles are 100 points. Funny enough, I don't know what the green squares are worth. I've gotten level 6 one time and usually end up with level 4 or 5.
Just a note, if you hit the orange circle next to the box just after the giant orange robot, it opens a blue triangle, and a purple diamond. There are two other places in this ride where an orange circle opens up purple diamonds.
Don't forget the diamonds on the roof of the dark tunnel.