Great game, I like it a lot. I played with the Scout and Cargo for now. I hope you add more missions soon. You could expand your ideeas and create other obstacles and puzzles.
Graphics are good, you choosed some nice colors matching perfectly.
I'm curious, how many sprites are you using for creating the enviro (that the ship can collide with), with how many collisions per sprite ,approximately. I see that you use the physics behavior.
Good luck !