You're right! I could have sworn the left-hand exit didn't work! But I've just tried it now and it does. So the intended solution is for the left lemmings to go into the left exit?
I think Essman had no idea what the intended solution is.
In the old version, I pointed out to Essman that there is a trick (which also works in PC Lemmings) that allows you to blow away enough of the bottom steel block so you can mine down to the exit. And I pointed out that the solution of building up through the pit would be extremely difficult to do in the old version, especially since you need to start a number of your builds as close to the wall as possible to get high enough, plus there are other lemmings milling about making it even harder to get the right lemming to build. And in the old version you can't single out lemmings or arrow-click them.
I didn't think Essman would actually honor the trick solution in the old version and do so by removing the steel in the new version, but well he did.
Given the enhanced capabilities in the new Cheapo, I guess building out of the pit isn't as bad anymore, and so maybe it's better to go back to the previous version. I'll have to think about this more. Actually, it would be cool if there really is a way for the left lemmings to get to the right exit but I believe I've convinced myself that this can't be done.
As for 'Good Luck', I'm still really stuck, and it's only a fairly short level!<snip>
Ok, you're on the right track.
(SPOILERS/HINT)Dig more to the left.