Funny thing happened to me with this entry: originally I was put off by the fact that there were no fish and no feedback for catching a fish, but then I went to the shop, sold all the fish and got a couple of upgrade and that allowed me to get more fish faster and upgrade more and all of a sudden I was hooked. I was a bit sad that I reached the maximum pretty quickly.
I guess it shows that you can have a game with rough edges that's still fun if the game loop is satisfying enough. So good job in that regard. If you add a bit of polish and more money sinks I think this could be quite enjoyable for a little while.