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kill everyone but one guy. just wait for ufos to come and snipe them when the last guy gets low enough kill him, do the same for each lvl soon those ufos will give some massive points. rate up so ppl can see :D
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It is pretty close, one thing you forgot, when the aliens number dwindles, there speed increases. It is way too easy now. Also, if you to add an extra touch, animate the march, if you notice in the original, they each move one frame apart in timing.
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this is my high score 9999999999,9999999999999,999999999,9999999,999999,99999,9999,99,99,9, and here it is easy i am in the past now lol :D