Funny concept, but you could explain it for people that don't know about that bug. I got to the part where you have to throw the crate onto the button, but I fell back into the hole when trying to get another crate (and stopped playing). Don't make it too difficult when it doesn't need to be, then the game just becomes frustrating.
The motion blur was also bad, but luckily there was a toggle in the optionsmenu. Perhaps you can also improve the controls, the movement isn't very precise and hold LMB should be press once to pick up and once more to drop (just like in half-life).