According to creativecommons.org, a CC BY-NC license stands for a Creative Commons license that prohibits you to use the material in "Commercial Purposes" and for the commercial purposes they have defined it in this way:
A commercial use is one primarily intended for commercial advantage or monetary compensation
As freemium games (especially mine) can be played without spending even a penny and the in-app purchases are only meant to accelerate the process (so is not primarily intended for commercial I think?), is this game still intended as a commercial project with the definition given above?
And should I ignore using such music?