Can you go into more detail about the character creation system?
Well, I can try

After selecting a race for your character, you 'grow' your character from birth through their childhood, and teens to adulthood (or further) by picking 'lifepaths'. Each lifepath represents a number of years and comes with a set of skills you can acquire and defines some of the characters traits, stats, and resources. And each lifepath leads to one or more other lifepaths, representing the decisions your character made (or decisions that were made for them!). E.g. your character may decide to move into a city, be sold into slavery, or conscripted into an army.
So, depending on the race, you have a more or less complex network of lifepaths. The cool thing about this is that it also tells you something about the way a race's society is organized. And the Burning Wheel comes with some pretty exotic racial choices, e.g. Giant Spiders or Wolves!
So, creating a character is a bit like a mini game: You can either start with a goal, e.g. "I want to play an alchemist." and then look for the different, interesting ways to get there, or start with a certain premise, e.g. "I was brought up by wolves." and let yourself get inspired by the possible leads, picking what sounds cool and marvel at what you end up with.