Needle's review had some great points.
I enjoyed this enough to watch it through. It had very good scene-to-scene directing, enough for it to overcome its somewhat cliche'd concept and artistic flaws. Yes, two tones of shading to the colors would help. drawn shading, not gradient fill.
My favorite part was the ship exploding, you drew that well in angle and perspective. Thumbs up for that.
I have a plot-related question. Why were the bad guys standing around and not trying to evacuate if there was a bomb timed to go off in a minute? That confused me, unless all the bad guys didn't know about the bomb, aside from the leader in the white pimp suit and his pilot.
Perhaps a little text intro or something could have cleared up that part of the plot.
Just some constructive advice. Entertaining little movie.