Time Pilot

Hints:
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Here's one way (although a boring one) to get a great Time 
Pilot score: 

1. Finish the first stage as soon as possible

2. On the second stage, don't shoot anything!! 
Eventually, parachutes will start to appear. 
Collect the parachutes while avoiding the planes. 
Each parachute (after #4) will give you 5,000 points. 
It's possible to roll the machine over (999,999+ points) 
while remaining on level 2 using this strategy.

By the way, while using this cheat you can also shoot 
the 1500 point bombers without causing the time bar to 
be shortened.