Same with jumpinjimmy.
The sniper mission makes you score a bit low. although the sniper attack from the command center wont help that much. it has a cooldown too zzz..you should've made a way to like make another sniper or remove the ones that when you kill multiplies, you do know how slow the sniper attacks or just put a invisibility special ability on the sniper like the starcraft sniper(terran ghost).