Potential is there BUT CRASHES IN MIDDLE OF GAME

Potential to be a great fun game and is until u work ur but to advance and right in middle of the game it CRASHES and uhave wasted 15-45 min trying to advance and clear a level then it crashes! :( then u restart ur ipad to clear any memory and it still CRASHES! Please fix this.

Wmbnc about Blighted Earth, v1.2