I've never been fishing in my life but this is pretty much what I expect it's like.
But seriously this game is awesome, the core gameplay is fun but the story (and hidden story) adds another dimension to it. And the crappy art is so endearing.
I'm actually not sure if I made it to the end - I got all the upgrades but I wasn't sure if the last text I saw was the end of the game. I didn't find anything new at the deepest level.
Overall, awesome work!