For those saying it's too hard/laggy, just do this: fill all your elevators with level 1 turrets (the 100 dollar one), then once it's full and you can afford it start replacing them with lasers (don't bother with upgrades). Lasers don't cause lag, and you don't need to click anything.
Very innovative, good game. Only thing is it's a little short, and once you figure out how, it's kinda too easy. Perhaps a little rebalancing of weapons is needed, and some variety in your personal weapon (I didn't need to fire a single shot after level 3).
 "Learn to Fly 3")
 "Dream World"){kind=icon}
 "Cursed Winds")
 "Storm the House 3")
 "Multitask")
 "The Next Floor")
 "Toss the Turtle")