personally, I like that work, especially the detailed structuresnear this "eye" of the mother ship. Also, the flames aren't bad, but they look a bit metallic, in my eyes.

Maybe those smaller ships are a bit strangely shaped (reminds of mosquitos? lol), but still they look quite good (in terms of pixelart - it seems like lights / shades are quite good there).

Something really nice. how many colors are being used?