I also had a prpblem with the teleport but I figured it out. U must hold E to use it. I still can't figure out what to use the Stone wall for. Any clues?
I also thought at first that the game is hard but reading through the comments I found a strategy and now it's quite easy. The most important thing to remember is that the second part (after saving 50) is much esier and faster than the first, so if you save 50 with at least 20 lives you should win. As for the first part to avoid the moving wheels the stick to the far left than to the far right strategy works quite well. And you also avoid some other obstacles to, that way. Dropping 2 or 3 men at once also works good. Hope this helps:)
 "Cave Explorer"){kind=icon}
 "Parachute Retrospect"){kind=icon}