Robotron X

Hints:
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To play strategically, select the overhead viewpoint.
The secret to staying alive in this game is to keep moving,
firing at the robotrons on your trail and at the occasional
robotrons in your path.
Alternate your shots as you move by rolling your fingers on
the keys and combining two directions to create diagonals
rather than searching for the diagonal shooting key with your
finger.
                         
Save your game every time you progress a level, but be careful
not to overwrite a game that has more remaining lives than the
one you’re saving.