136? I always tried to jump over the skeletons a kill them from the back, but I got overrun with skeletons from both sides at one point.
Occasionally you get bad odds and to many skeletons will spawn to early. But the idea of the game is eventually you get overrun by them and die, or you make 1 mistake and die.
You need to be really proactive hunting skeletons until score 10-17 to get your first upgrade as quick as possible, which will improve you survivability loads.