Ah, okay. Three is enough. So I'm not sure exactly where you're stuck since there are a lot of places here where it looks like you'll be close, and then lose the plot (as I found out the hard way), but a few suggestions:
1) First thing you need to push across is the flag, This starts with two of the starting cats plus the revived cat from the medusa section, and using the "cats don't turn unless they move" mechanic.
2) Never push a cat across the conveyor, only flags and rocks.
3) I found it easiest (maybe necessary) to stash the level-ending cat in the south tunnel to set things up so that I could recharge moves by moving up onto a flag, since otherwise it was too easy to either walk onto the spikes or accidentally walk onto the conveyor.