I have maxed out my animals (including frogs and turtles) and the zoo size. I'm currently sitting on 1.8 million dollars with nothing to spend it on. I love this game, but I believe it could be expanded greatly to keep the user's interest in it. Look at some of the storm 8 games... they take potentially years to get to the top. Leveling up for me only has so much excitement, so please include some more expensive items to spend all the excess money on!