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Another game based on a ZX Spectrum game I enjoyed in the 80's. This is "Ground Attack"
You fly a spaceship through a cave, the cave gets thinner (or will do when I actually used the level editor). There are missiles which launch at you and odd blinking things (that I could never figure out what they were supposed to be) which hinder your progress. Make sure you destroy the fuel dumps (the blue things) for extra points.
Use your trusty laser with the (b) button and drop bombs with (a). Move around with the arrow keys. Don't hit anything or get hit by anything. Make your way to the end of the cave and enter the portal at the end (blue circle).
I've no idea what was at the end of the original as I never got that far.
I've been experimentally making a level for it.
You have 5 lives. There are now checkpoints so if you die, you start again at the last one.