I intentionally wanted a small game so that I didn't have to do too many images. Nevertheless, it has some nice puzzles. I'm surprised that people had a bit of trouble moving the gorilla, as the solution is one of the first things I always try when I have a seemingly immovable object.
I spent a lot of time on the coding, as there was a lot of new things that I had never tried before, including proper containers and multi-word input. I also restructured the on_command section quite differently to the way I've done it in the past. It was all a learning experience.
The ladder was a last-minute addition. I don't know if you tried this, but if you drop the bamboo stick on the zookeeper, he returns you to the gorilla enclosure. I needed a way for him to reach you, hence the ladder. It also makes sense that there is a ladder for someone to open and close the skylight from inside the office, but the ladder is too big for a little chimpanzee to move.