After earning enough experience points from missions and murder, you are awarded a level up and a new ability. (thatvideogameblog.com)
Once you get enough experience points, you'll be able to unlock skills to improve his abilities (including the web swinging speed). (wccftech.com)
Once enough experience points have been accumulated player characters can periodically level up, making them stronger or giving them access to new abilities. (feministfrequency.com)