Indie game storeFree gamesFun gamesHorror games
Game developmentAssetsComics

Well for future reference then, this is the relevant settings dialog and how it must be set for Tilemancer:

I can't say if other versions of OS X are the same, I'm a relative noob.

Great application by the way! I've only done a bit of fiddling with it so far, but I'm looking forward to making a game with it :)