Flying spikes and UFO's ought to be removed from 1000 feet high and up... you can't even see where you are to avoid them. Totally unfair. Another suggestion, have a badge give an effect to reduce the population of spikes/UFO's/both.
....That sucks so hard. I got to within 200,000 of the 3,000,000 feet goal when I got abducted by aliens. I still had my chest bomb intact too, and about 90 nukes left.