-2000 Lines of code (2004)

I think lines of code could be an interesting and valuable metric.

If the lower (negative) score, the better (given a fixed set of features).

“Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” ― Antoine de Saint-Exupéry, Airman's Odyssey

That just encourages bad behaviour in the other direction though. A massive multi-level nested ternary on one line is usually going to be worse than a longer but clearer set of conditions. Trying to make code brief can be good, but it can often result in an unmaintainable and hard to read mess.