I think this game is a bit different than http://gabrielecirulli.github.io/2048/ Take a look at this situation:

   ___________________
  |___2|____|____|____|
  |___2|____|____|____|
  |___2|____|____|____|
  |____|____|____|____|

in the original the result of going up would be

   ___________________
  |___4|____|____|____|
  |___2|____|____|____|
  |____|____|____|____|
  |____|____|____|____|

but in this game it's

   ___________________
  |___2|____|____|____|
  |___4|____|____|____|
  |____|____|____|____|
  |____|____|____|____|