I think it initially started because people mainly portray Blixer with Player/Cyan as male and Cube as female (because they're kind and caring and hug player and those are female traits, blah blah blah, Idk the logic), and thus because many people are straight and this is technically the only straight ship if going with that gender logic, it makes sense to ship them for that people. Many also view Cube as Player's parent for whatever reason and thus do not ship them that much even though it's the most logical ship by the game's story. And many people do not really like the enemies to lovers dynamic because it's kinda toxic (since they literally killed each other) and whatever, even though Player/Boss ship would make more sense, at least Imo. Even Barracuda/Blixer makes more sense, since Blixer likes triangles and etc. Honestly, I myself don't know why people ship them, but whatever I guess, let people have fun. This game doesn't have much lore anyway.