I have ported it to OS4 but I haven't released it yet as it is not quite finished. But when it does get released the source will be available in the official Allegro Subversion repository.
I don't plan to do a 68k version as I don't have a classic Amiga any more but with the source code released anyone can updated it to make it work on the 68k and all the hard work is already done. :-)
The only thing is that I am not sure that performance will be acceptable on 68k - even on my 800 Mhz AmigaOne it's a bit slow. It's graphics architecture isn't very easy to optimise. :-(
