Are you seriously 13? If so, this was quite an accomplishment. Few points of feed back.
Why hire staff but I still have to feed the animals? Can't I delegate some zookeepers for feeding?
Also, is there a correlation between ticket price and attendance? I think in the real world, it would be inversely proportional, but I haven't tested it out too much.
Finally, the move speed of placement in the map screen could probably be slowed down a tad. The button to finish is also tied to movement, so watch that.
Overall, fun little game, I had fun trying to min max it. At 13 and this is your first effort, you should be very proud of this work. Please keep it up and some day we will see you at the top of the steam charts I'm sure.