The rules page seems to be gone and gives a 404 error. Are there any rules about release platforms? I'd like to use a game engine I have been working on for a while now, but I can currently only make builds for Linux. I know that that will lock out probably 98% of the playerbase (or maybe less? Don't know how many game devs here run linux), but that isn't really my concern.

I'd be happy enough if I just managed to make a full game from scratch with an engine made from scratch :P