I like the concept a lot. It took me like 5 minutes that I was supposed to max out the distance, and then go back to 0, maybe you could add an indication that that's the case, like fish biting, or a cast/reel animation or event, so that I know that I'm casting the line, and then reeling the fish in.
I don't really like incremental games, but this was kinda cool. I didn't complete it though, it felt too grindy, the last upgrade I got was +50 money per sec, if you're curious how far I got.