@MrHyLyfe It means that game has a lot of mechanical complexity, in terms of rules and numbers and whatnot. The opposite of crunchy is fluffy.
Pathfinder, D&D 3.5, and Shadowrun are crunchy.
FATE and Apocalypse World are (relatively) fluffy.
@MrHyLyfe Wow this is crunchy.
Based on the description in step 2 on page 17 of the core rulebook, I'd say that the percentage you roll doesn't have any in-the-moment relevance; it's basically a small experience point tracker for levelling up that particular stat.
@MrHyLyfe Yuup, the Building Points that you get for character progression are used to buy fractional (.01's) stat points (among other things) at a rate that decreases as you progress (so it is difficult to get too much better than you started out).
The core rules also seem to foreshadow that it might matter for skill checks because they take place against your "complete" stat score rounded down (e.g. two thirds of 10.01 rounded down is different from two thirds of 10.99 rounded down).
@rngesus_wept if it doesn't work out I'll just make up something else.
I am the GM, I am the rules.