I was thinking while playing the game if Markiplier would ever play it. And then I thought of something that may attract him, and would be something lots of people would like.
I was thinking about some of Mark's nicknames because he had so many. And I just happened to think of his nickname "Markimoo" when a shark attacked. So Thought it would be pretty awesome & funny if you added a shark that had a pink mustache, an iconic Markiplier image. But make it so that the shark has a 1/1000 chance to spawn when you kill them (when you attack them when they're eating your platforms).
I just thought this would be a cool add-on, like a little Easter Egg :3