One other glitch I found... Newton must not have existed in this system, because the spaceship slows down automatically. Either that, or outer space has a high viscosity.
Sometimes a bridge segment holds, sometimes it doesn't...
Sometimes a crate falls completely through a walkway.
And sometimes the workers run FROM the crate.
Love all those red herrings in the final "hard" player-made level. At least, I assume they were red herrings, since I never touched them and made it to the exit.
Not so sure about the physics here... seems like the balls get more total inertia when they hit each other.
Also, maybe only allow the player to drop the box so many times?