Honestly, I would focus on your portfolio. Todays world seems to be heading in a direction away from checking college degree and more towards showing what you have already done. You already have some college, which is a great thing, but even if you do continue college, you will still have to work on your portfolio before even getting looked at. If you are happy delivering pizzas, and have a dead set dream in game design, then I know you can make it!
Not trying to say that college is a bad thing, just from experience in programming, I have never been asked "What is your highest education level", but always being asked "Can I see something you have done before?"