I definitely understand why you haven't made the code open source as of yet. I hope that at SOME point you do (perhaps this project can go open source in the future, when you've had time to build something even better), because I would love to see mapping tools, and mapjams challenging modders to create the best levels they could with your tools while maintaining specific size limits.
This reminds me of .kkreiger, but this is honestly so much MORE impressive to me, given the scale and the visual variety you pull off -and in a smaller file space. You've done phenomenal work here, absolutely phenomenal.