Actually, the game idea is not as old as the NES Mario Bros. It's as new as the Mario Forever games, from which you stole the refined graphics, the goal, the engine, movement... i could go on, but it's pretty clear. You're a f***ing retard.
lvl 61, i played the money hack version and anything beyond lvl 116 is simply not possible. I Also don't see why the price for a new tower gets RIDICULOUSLY high in the later lvls.