Yes the day counter is indeed broken. We procrastinated and we kind of ran out of time... We weren't able to do all things that we wanted, like fixing the day counter and upgrade info. The fishing pole is supposed to increase the chances of getting rarer fish, and upgrading the boat will increase the maximum number of fish the player can catch in a day, as well as make the screen bigger so that the player can see more fish. This info should have definitely been displayed somewhere...
Thank you so much for the feedback! It is really valuable for us to see what people think of the game