Burn

Burn is an esoteric programming language written by User:ais523 in the past. Unfortunately, they forgot the details, but the language may be reverse-engineerable from the following program (the only one ever written, which has minimal comments):
 * Colours given as BG, levels 0-3.

00 00 01 00 00 00 10 11 01 01 01 11 03 20 11 00 00 11 00 00 11 11 11 11 00 00 00 00 00 11 10 10 10 10 10 11 00 00 10 00 00 12 00 02 11 00 00 11 11 11 11 11 11 11 00 00 30 00 00 21 00 00 01 01 01 01 That's a rule 110 interpreter, by the way. Anyone who can figure out how it works, please help...