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No Enemy Shots:
[Note: this only works on revision A motherboard releases.]
On the first or second stage only, shoot all enemies except for the two, far most left blue enemies (they are one above the other). Then basically wait near the bottom right hand side of the screen without shooting either of these two ships, or getting hit by their missles. After 9-12 minutes of waiting and not getting hit, the enemy ships will quit shooting at you. Let them cycle a few more times to make sure they have quit firing all-together. If so, then go ahead and shoot them, and continue the entire rest of the game with no enemies firing missles ever. All you have to do at this point is dodge falling ships the whole game!