We are continuing the project, but in the version for the Jam, the only bullet with a special effect is the one that knocks enemies back.
The other bullets have type pairing (Life-Death and Fire-Ice), if you hit an enemy with its opposing type you deal 2x damage, and if you hit it with its own type you deal .25 damage, non-paired damage is .5, and neutral does 1x damage
The "gimmick" with the final boss is that when you hit him with a super effective bullet, his type changes, and 4 times through the fight he spawns enemies, he is more of a damage sponge than we hoped given how easy it is to dispose of the waves he spawns
Going forward the typing is going to be simplified, so hitting with their type deals 2x damage, and all other is .5x, with neutral always being 1x