Forget that little Roman guy! For your square pizza needs, I gotta go with Jet's Pizza. They always have good coupons, so snag one for a deal. We split a small specialty pizza (6 square slices) and a drink for around $10. I guess they're known for the square ones, so give it a try.
This location is also nice that it's in a walk-able part of town near the downtown Matthews area.