I have toy compilers for FORTRAN and Logo- perhaps one of those could be a good candidate? One of the main reasons I built this program was to help expose people to Forth, a language that I find very beautiful and powerful. It should say something that I wrote the game itself and its Forth engine in a dialect of Forth, too. If there's something you find beautiful about COBOL, there's no better way to share that than writing something with it. I'm always open to new languages, but for the process to be fun it needs to be a language I enjoy myself. At any rate, when I make other games in this vein I will always try to come up with designs that highlight the power and uniqueness of the languages I use.