Six & Six dev here, a lil late but better than never I guess. There isn't more in the game, it's got a six-wheeled offroader stuck in the snow, it's on the sixth day and you can survive a maximum 6 minutes(unless you are a fish god).
Who the main character is is currently up to interpretation, which was done on purpose, it's meant to be a chill game where you can relax and fish(and yes, die).