It's challenging (in a good way) to focus on both parts of this game at once. I really like the concept and found myself determined to keep playing to win (and I was pleasantly surprised to find more levels.)
One thing for me was the actual layout of the screen. The game (controlled with the keyboard) is on the left and the pee mechanics (controlled with the mouse) is on the right. I'm a lefty so my mouse is in my left hand and keyboard on the right so that cross over in my brain made it super challenging.