This could still be cooler. Seeing as you're working on this and you say it's appreciated I have some more Crits;

You have an inconsistent light source. The underside of the bottom wing and a few other places want for darker shading - even though it's in outerspace it still would look better with a more consistent lightsource from the top-right corner and then making the underside and back of the ship darker would make it 3D. The outlines/edges of the wings facing toward the sun/light source could have a bright/light color to give it more life and demension. The body is very flat compared to the rest of the picture right now (and is kinda approaching pillow-shading, ohnoes!). + yeah your outlines are very staircased/jagged and want for AA. ^^

In the game, it will be on a black background.  Black lines on the inside would look very weird on a black background in my opinion.  I do agree with you though for the outside.  I may add in some AA on the outside to make it fit in better. 

Thanks

Fuzion Creative

Actually now that I think of it as 'cartoony' it might look better with a black outline or something, I dunno.

Yeah probably, I was going for a cartoonish feel though and I thought they helped.

I think you overused the square highlights, or what ever they're called.

Yeah, now that you mention it...I don't exactly like the top thing either.  I'll play around with it and probably delete it.  Thanks for the favorite.

Fuzion Creative

I don't really like the thing at the front, but I love retro rocket ships, tres cool.