How do you get pass the 2 level.

I have played the 2 level over 20 time, this is no joke, 20 times I can beat it.
Give me advice, please.

------------------
I CAME ,I SAW ,I CONQUERED

All right here's the story: 15 minutes after I posted the first message i beat it. I was so pissed off that I went right in and wopped some alien ass!!!!!!!!

------------------
I CAME ,I SAW ,I CONQUERED