The first vid is a tutorial of how to get a 'Perfect' Bonus for kills in the first Bonus level, Jupiter.
The 2nd vid is how to get a 1UP and a perfect bonus for kills in the Earth Bonus level.
The 3rd vid is a playthrough of the Earth 2 level; how to destroy The Belt and kickoff 'Belter Madness' mode which contains a lot of fun mass destruction elements.
The 4th vid is how to get a perfect bonus for kills in the mars Bonus level.
And lastly, here is a playthrough video of the final level, Venus.