So I just got Braid and beaten it twice recently. Awesome game. Very refreshing take on video games, and a needed one at that. I'm a big believer of the potential of video games as an art/storytelling medium, and Braid exemplifies that idea.
So I just found out that Braid has a level creator as i was browsing through the program files. I still need to get my head around it, but I really want to work on it. If it wasn't this late I'd start now.. but.. I'm pretty tired. (Not tired enough to be up playing Braid though).
Here's the Braid blog and the article containing a tutorial.
http://braid-game.com/news/?p=576#comments
I'm but a novice to this game design notion. I've been playign games all my life, but I've still pretty new at this stuff. I'm currently going to school to study game art and design, but I really want to expand my knowledge as much as possible.
And not to mention that making Braid mods would be sweet.