Interesting. I like these kinds of transformations.

Really happy to see such an ambitious idea attempted for this jam. Don't give up! 10 days is so short, and interest compounds exponentially if you stay consistent and forge ahead!

My one recommendation, have you considered using a term rewriting system to break down your procedural generation explorations into smaller, more tractable projects, that will run and can be visualized every step of the way?

It's a pretty nerdy thing to use, but there's a great video on defining games in it's Domain Specific Language.

At the very least, you may find it interesting to check out for another project.

This has been quite interesting to read so far though I am only 1000 lines (half-way) in. I was debating how easy it would be to port to common lisp for me to really-look-at-it but your work is nontrivial.

(The tiles and things have ascii structure / inlined examples in the large linecount)

    (*

right

             0   1   2   3   4   5   6   7   8   9

    left 0   0   14  X   X   X   X   36  X   X   X

         1   1   80  X   X   X   X   70  X   X   X

         2   X   X   X   3   2   X   X   44  X   56

         3   X   X   34  X   X   26  X   X   42  X

         4   X   X   24  X   X   16  X   X   60  54

         5   X   X   X   22  12  X   X   54  X   66

         6   32  74  X   X   X   X   90  X   X   X

         7   X   X   40  X   X   50  X   X   100 X

         8   X   X   X   46  64  X   X   104 X   106

         9   X   X   52  X   X   62  X   X   102 X

                   tile, rot

    take the tile, and rotate it clockwise as indicated.

    *)