Abby, the game isn't free, it costs $13 with DLC FM Music Pack costing $8. You don't need the DLC at all, it just gives you an option to switch the music to 16-bit, gives you an extra 20 levels, 10 post–stage cards and all the music in the game to listen to. The main game will take anywhere between 15–20 hours to complete (at least it did for me). Definitely worth the price.