I had beaten the last level by luck. I just kept jumping off the cliff and repeating myself until I was able to jump to the other side. Maybe that's not how the level was meant to be completed but I cant figure out any other way.
Tips:
Use the shield to your advantage. Being invincible allows you to destroy mines giving yo extra points.
Dont use the nuke unless there is a lot of mines around. This gives more points.
Be patient. If there is a gap, wait until you are at the right angle to go through. There's no need to rush.
Make sure you collect those points. Do not rush fro them though. If you can reach them, go ahead.
Attempt #1: 592 seconds
Attempt #2: 855 seconds
Tips:
Conservation: DON'T WASTE YOUR AMMO! If an asteroid isn't headed your way there is no need to shoot it.
Preparation:Always have a shield handy. You never want to be caught off guard.
Desperation: Do NOT rely on your partner turret. There are not very accurate and have only semi-auto fire.
For me the ending was a bit odd. I almost went crazy trying to find the code for the briefcase. In my opinion it was a bit too short but still good. 5/5