Hey, we're still working on this, so thanks for your patience. In the meantime, a good deal of the game's music is finished, and you can listen to it at creator Jon Bash's soundcloud!
So far, 8-bit-esque renditions of the Uncharted theme (not to be confused with the start screen music) and London Underground (from the third game) have been created, as well as a boss battle-style remix of the Uncharted theme. Take a listen and see what you think!