My high score is over 1300. O___O Can't really tell you guys any tips because I was a natural at this game, never practiced all day or anything. But I can tell you with the grundo thief if you happen to miss one of the vats the coloured blobs might get lucky and hit him on the head instead. xP Saves you from having to click down onto him.
I'm just an epic fail at that game; I gave up on it a LONG time ago. Now SSing just makes everything easier. XD