Survival the Fishman the killer

Lore: You and 7 other people decided to build a treehouse, The treehouse was a freemodel that any other game has, but it was a nice cozy place, So you stayed here, a few days later, Disaster strikes when that "Thing" came to earth, The fish planet is tired of human cooking and eating fish, So now, the tables have turned, Bullets wont stop him though... Edit: I'm an idiot and bullets will 100% kill fishman