I encountered the same issue. I caught the right shoe with my last piece of bait and got some text about it. He says to finish fishing for the day and then it just continues on with your bait going into the negative with you unable to leave. :(
I'm a little confused why everyone is so excited. There's literally nothing in this demo. There's almost no gameplay showcased at all. That's not to say the tiny bit I played wasn't fine, it was, but it's certainly nothing to get excited about.
