Wow, beautiful. This game does a phenomenal job of capturing the value in catharsis. I actually really appreciated that the game didn't have an "ending." I just kept fishing, even after finding all the bones. This might not be the intended interpretation, but isn't it miraculous that there seemed to be an infinite amount of fish? .I mean, infinite amounts of fish sounds like a pretty successful fishing trip to me...
My own interpretation would be that as we work through hardships, we might come to find out there are things (like our relationships) that are endless. I believe joy is one of the emotions to be found in the many complex feelings we experience in trials.