Masterful top-down shooter Teleglitch - which is appalling difficult, and one of my favourite games of the year (or last year, really) - has a DLC, and it's called Guns And Tunes. This is fairly self explanatory: new music to score your inevitable death, and some new guns. There will be right more monster-mincing tools, and you'll even be able to select which of them you want to start the game with, or choose to have them randomised for you at the outset. The DLC costs £0.99.
You can read about what we made of Teleglitch just here.