Playing as a crab is already a funny premise, but throwing armed humans and nasty sea life into the mix makes it even better. Early runs are mostly about getting stronger and finding better ways to handle tougher creatures; the colony system gives the later game a bit more meat. Offline helpers are a nice touch too.
The full version is unlocked, and the shop content is available to purchase for free. Nothing here is terribly complicated, but watching a scrappy little crab turn into the boss of its own patch of coastline has a certain appeal. It works well as a light survival RPG with a bit of colony-building on the side.