Er, you could have done the terrain with normal bricks rather than cubes only. Usually you can achieve the same effect but more functionality with plain bricks.
Of course, it's not a bad idea to combine the two, but it can get clunky in some spots where you can't walk up.
Also I know about the jumping, I was commenting on the fact that it's not that easy to navigate the terrain. I've made plenty of these types of TDM-style builds before.