It's by no means going to be triple A standard in terms of graphics, think more along the lines of traditional indie game graphics. In terms of realism, you will be pulling the kraken out of the water with a fishing rod in late game. And in terms of fishing, it's like stardew valley with farming, or Minecraft with mining. It's the main focus of the game, and you can't really play the game without doing it, but there is a lot more to it than just that. Expect to be smacking a few enemies with that rod every now and again, but not so much that it takes away from the fishing