oh, i guess i know.
golvl2 - go to level 2
golvl3 - go to level 3
ship - unlocking the first ship
ship2 - unlocking the second ship
super - starts with the strongest weapon
One small tip:
if the coming number is odd one, fire 3 first first to make it even, and just keep shooting 2's.
but it won't work when a huge number is coming... :(