Colors are all to the zx spectrum spec :D
as per this
<img src="https://upload.wikimedia.org/wikipedia/en/thumb/f/fc/Spectrum_Altered_Beast.png/320px-Spectrum_Altered_Beast.png" border="0" />
play the early build here
This game is excellent!
i keep playing it even though it hurts my eyes Dx, you might need to mess with the colors of the background a bit but besides that... awesome color palette, nice soundtrack and very challenging, now i only need analog control :3