This is really great! I loved the live coding demo with the sine wave animation. You've inspired me to do some more hacking on my pet project. I am developing a 2D game engine in GNU Guile Scheme and it shares many features with what you've developed:

- A "cooperative" REPL server that plays nice with the running event loop

- An Emacs development environment with Geiser providing the remote REPL integration

- Cooperative multitasking using coroutines and a scheduler

- OpenGL renderer

- Functional reactive programming