Hey! I haven't posted about it anywhere else, so lets see... The game has 4 Color Palettes, which 2 of those are unlockable ones. You start of with the COLOR, and the ORIGINAL one.

UNLOCKABLES:

SECRET Palette: Beat ARCADE Mode or INSANE Mode once. This is a ZX Spectrum like palette, it's cyan, magenta, black and white.

RELIC Palette: Beat ARCADE Mode with at least 50K Score or beat INSANE mode once. This is a Gameboy like palette, with the greenish screen.

Well, that's it!

I haven't forgotten about the Player's Guide Part II, it shall come soon...

Thiago Avidos