I painstakingly stacked objects to jump on to get on top of the building with the grate for a ceiling near the final boss and was disappointed to find that I could not jump off that building to get out of the level. I did however see a crystal of madness next to a teleport pad while I was up there and eventually figured out you can jump up one of the silos to get out of the map, which is illustrated in this video.
I don't know if there's any point to getting out of the map like this but I thought I'd share it since I didn't see it anywhere else online.
![](https://s2.save4k.ru/pic/LCuWqp3oAu4/maxresdefault.jpg)