AFAICT, the "derp" dog means you won, aka reached 2048. With a score that high, you probably had a derp, although you may not have. My personal best is over 53000 on the conventional game, well past 4096. I highly recommend not letting yourself get sucked in any deeper, though. With a score of 12440 you probably have a solid strategy, so it's probably more luck that lets me get as high as I did.
I got a derp on this game at 9000. So derp (the top of the table), must mean "1024". In which case I take back my comment. It's possible to reach 1024 with a strategy only slightly little better than random shuffling.
Has anybody combined two derps to see what happens when the list & images run out?
