Ill ignore the fact that there's LOADS of colours, i think a big problem is that the Wingls look like those Wafers you can get with ice-Cream, Id prbably Try eating the ships wings if i were there
That's too many colors for such a simple sprite, really. You could work on the colors choice, since there are 33 colors and you could make 16 with that metal shining effect.
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the palette leave much to be desired