Nice to see you on here :) I recognized the name on the front page, but I don't think I'd actually seen the game before... perhaps I just read it from you somewhere.
It's an interesting concept for a minigame - simple and easy to grasp immediately, but quite unique - and a very difficult one especially on Hard. I can't imagine how you got up to 5,600! The reviews before mine have good ideas about being able to control the spine - having a slow spin and being able to hold down a mouse button to spin faster (or to reverse the direction of the spin) might increase the skill of it a bit.
Also, I know I go on about this every time, but it's important to me - think of the colourblind :) The colours you chose for this game aren't too bad (though the green and red are quite difficult to tell apart), but some sort of secondary identification, like making them slightly different shapes depending on the colour, would always be helpful.