The idea is, at its core, simple. You're trying to build a contraption that can get a pink ball to a pink square. You don't even have that many tools to work with, just a few different types of wheels and rods. The challenge (and the joy) is figuring out how those components all work together in-game.
If we have a problem with FC, it's that the tutorial could be a bit better. But at the same time, we can understand why playing with the physics is probably a lot easier than trying to get someone to understand them. Give it a spin and let us know what you think.