I think Omen has 2 moves when he's about to die. Just use Shatter when he's near 100k, I guess.
And Pala set idea sounds kinda nice. But it's quite a hassle.....
Good way of encouraging cleaning of mousepads.
But probably just adding a crosshair in the middle won't hurt much : \
And I think speed should always be positive 'cause it's scalar
IMO, the hardest levels are the 50's. 60's are kinda but depends a lot on luck. the 70's are lamely easy but cool. I like the bees (or tadpoles?). But they are one of the power-ups which proved too powerful weapons.