First of all- I see what you did there :) Kudos for the c# reference. I almost wish, you went further with it. It could be that bouncing the red code would add a generation (like an actual .net GC). Nevertheless- I liked it!
At first, one thing wasn't clear for me though. Since game displays both time and score, I wasn't sure which one I was going for.
Additional kudos for null references, when passing red code :)