Tell us something more about your proyect, something like a shoot 'em up can be... anything. I myself don't know what I'm looking at, is it the main ship of the game? If it is, it seems interesting to make a very minimalist protagonist for this genre, but it can be polished. Remember that memorable characters aren't just good looking, they are interesting to watch and follow throught their mission.
I don't know if is this monitor, but the screw-like dots you are using are almost invisible, try more contrast, if you want to keep them, as they give a coarse-scrap looking. Of course I just keep on writting without knowledge, but to get a good idea of futuristic minimalism, think about something like, mmm, Eva, fron Wall-e, she is clean, and soft, and have smooth shadows... try making some shading to give it a round effect (think about a cilinder), and as the action (proton cannons emitions and things like that) probably occurs up in the screen, it probably would be better to draw the shadows in the lower part, maybe giving a more dramatic looking.
Don't forget contrast (don't excess either)! If you try to draw those shadows, you probably want to make that darker area in the middle-low part a bit more brighter.
Also, is there some limitation in the color palette?