Yes, the higher the card number the higher the bonus damage of the weapon that correlates. and the skull cards do different on hit effects. Such as Bonus damage, damage over time, and a slow.
Hey! thanks for complimenting the art! As Erastus has stated we are trying to clarify things where needed, if you haven't i would try playing the downloadable version, some of the issues i had from the browser were fixed once I played there.