I went ahead and bundled the latest version with the coop level included. The previous single-character levels are available as tutorials.
I had to fix a couple of things that got broken while I was working on the coop level, and I might have missed something, but for the most part it looks fine. There’s an small issue with frustrum culling - some lights (and camera fields) tend to get culled while still on screen and sometimes causes some small glitches in the 3D sections, but it’s not a big deal.