The "dark block" was the barrier on the right side of the first scene in was in (not sure if I was just in the tutorial). It was a barrier and it was to big to jump on, or I couldn't figure out how to jump higher, so ended my game play.
Thanks for coming back to explain! If it was the tall wall, you need the rope (right click) to climb it. Sorry that wasn't clear enough. I'll make it much easier to understand after the jam!
