Big fan of the palette and design of the bug creatures! The "splat" of the one being destroyed is especially cool! Outside of the colors, were there any other limitations you imposed on yourself for this piece?
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This is Gigascreen on ZX
en.wikipedia.org/wiki/ZX_Spectrum_graphic_modes#GigaScreen
About limitation - 4 colors per tile 8х8. color combinations depend on neighboring pixels.