Author here- glad to see this project gathering a little interest! The most elaborate Chip8 program I've written using Octo so far is an adventure game called "Cave Explorer":
If anyone decides to tinker with games of their own I'd love to hear about them. I've also written quite a bit of documentation including tutorials and chip8-specific coding tricks which can be found on the project's github page: https://github.com/JohnEarnest/Octo
http://johnearnest.github.io/Octo/index.html?gist=a1d72c7bbf...
I still have 285 bytes of RAM left over, though…
If anyone decides to tinker with games of their own I'd love to hear about them. I've also written quite a bit of documentation including tutorials and chip8-specific coding tricks which can be found on the project's github page: https://github.com/JohnEarnest/Octo