The Green Legion

The Green Legion is a PICO-8 shoot 'em up by GuerraGames, posted in October 2016 as an entry to the Procedural Generation Jam. Its enemies, mini-bosses and end-of-level bosses are generated procedurally, so each of its ten levels differs between playthroughs, and holding the fire button slows the ship for precise movement. Levelling is driven by damage dealt, one experience point per bullet that connects, and awards extra ships that trail the player: these serve at once as lives, as helpers that shoot forward, and as bombs, since a power attack clears all enemy bullets at the cost of putting an extra ship on cooldown. Death carries no penalty beyond restarting the current level, with experience retained.