The game has got a lot of messy code and needs a massive rewrite. I suspect that he coded himself into a corner that he cannot get out of and doesn't know how to add multiplayer without breaking everything else.I'm just saying that it MIGHT be a reason. There's probably a lot of reasons why he's not updating it, but maybe he just gave up when he saw his game here for free. Even if he makes an update that prevents people from playing the game without a code or something, people will crack it, like all the other patreon games here.