Updates to Limbo have been released. The updates will be applied automatically when your Steam client is restarted. The changes include:

- A crash bug caused by custom DPI setting in windows has been fixed
- Controller detection has been improved
- Option to change resolution and windowed mode added to settings.txt

See the sticky Limbo FAQ on the forums for more information:
http://forums.steampowered.com/forums/showthread.php?t=2047244