Hoping to participate in this LD.  Been playing with / checking out some terrain generation stuff lately, I may incorporate some of that if the theme is applicable, check out: http://www.barankahyaoglu.com/blog/post/2012/04/28/Map-Generator-source-code-is-available-now!.aspx and http://simblob.blogspot.com/2013/11/updating-polygon-map-generator-demo.html

Tools: Paint.NET, XNA/Monogame or Flixel, Autotracker, Sfxr, Audacity, the usual suspects.

Good luck all!