OK, since necroposting on ROW is apparently allowed, I'll start with the oldest first.
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This game has always been one of my loves.
Hints: Unless you are chasing the spy ship (ALWAYS chase the spy ship, letting it get away will cause instant RED ALERT), turn your back to enemies to fire at them with the rear gun, you will run into them less often
Don't kill bases right away by blasting the center. Blow off a few cannons before moving in for the kill. You'll get a lot more points.
As mentioned before, you MUST kill those annoying spy ships, and once it comes onto the screen it will move away from you to get away. If if does, you are blessed with instant RED ALERT status and will be onslaught with enemies until you die.