I managed to get all three on Back and Forth like this: 1) click under the green guy to put him on the platform, 2) move the platform to the cat, 3) drop the cat, 4) move the platform back, 5) drop the army guy, 6) shoot the laser at the crates, 7) and again for the next ones, 8) remove the top of the two sloped bits, 9) click under the blue guy so he and the crates drop and then 10) time the laser so it hits the crates as they fall. I managed to get three of them, and the blue guy fell over the other one to the cat below. Hope it helps!
The game is now significantly more easier than when it was when you left this comment, so I would appreciate if you took a second look. There are now checkpoints too.
The hard badge wasn't particularly "hard". More like "time-wasting and not fun". The hardest part is continuing to play such a poor game right to the end.
The core game is pretty good in principle, but as many commenters have pointed out, the game is not very well polished. A bit more design work and this might have been really good. Shame.
The game is now significantly more easier than when it was when you left this comment, so I would appreciate if you took a second look. There are now checkpoints too.