DAH BOOTH.
Just note that the new demo has some awkward issues here and there, and trying to fix them has been utterly infuriating. I've only just updated the web player version with the last missing content, the desktop version will come a bit later. Most of these issues stem from the save system, try and avoid using it if you can, it's not that difficult to avoid dying anyway.
But, yeah, enjoy! I hope I didn't break the game too badly with the changes.