A bunch of videos of the game in action.
Roosterteeth’s Rage Quit : warning, this one has lots of swearing ! This video came out on launch day and has entertained more than 2 000 000 viewers to this day.
BrandTanooki’s playlist. Complete playthrough with one video per level.
TeraBrites’s playlist. Also one video per level. Doesn’t have level 9 though.
GameTopicTV’s playthrough of the first 8 levels. This guy’s good !