right off the bat let me say for a first foray into professionalism, im impressed. not to say there isnt room fro improvement but you got me wanting to turn the page. im no rpofessional comic artist but i read enough comics to know when im hooked.
let me start with perspective its something i have issues with sometimes (more often than ill admit). the second panel you can tighten up the window lines and get a vanishing point so both windows look like there flush. the fourth panel his body doesnt look like its lined up with the door like it should be. i love the premise and the characters. i think you were going for a cartoony feel (i hope otherwise i put my foot in my mouth) and it looks great but in a futuristic spaceship you might want to add some dodads to the environments. the rooms look bare.
the coloring looks great, nice color pallette for the heroes. im not sure if you did that and the inking but i know i couldnt do better. ok thats it, i hope it help. p.s. post page three.