Went through the revised levels, I guess I found a couple of backroutes and a couple of intended solutions.
1: Looks intended. Non-trivial for a starter level, but nice and clean.
2: Looks like a backroute abusing intricacies in the terrain.
3: Another hackish backroute.
4: Given the leftover skills it looks like a backroute, at the same time I have the hunch that the extra skills and terrain are just a red herring and this might actually be intended?
8: I had the key idea at the end of last session already, I was just missing the idea of going under. Now it's quite clear there's no other way, and everything else fit together pretty much immediately.
9: I worked hard for this backroute, haha. I separated the lemming that gets turned around by the second bazooka shell using a jumper.
10: This might be intended; if it is, it's pretty epic. When I saw the climber climbing through the spear I thought I have to do everything again, but then he magically ended up at the exit through the other path. So the spear is not actually needed. Only minor gripe is that the stacker placements are a bit precise. I messing around with mortars to see if I could turn the umbrella into a ramp, but then gave up when I realized that even if possible, it would leave me one mortar short.
I think we got a bunch of backroutes and a few intended solutions again.
2: Another backroute, though I have an idea what you might have in mind for the solution.
3: This is ingenious. Took me quite a while to spot this, while I was messing around with the second thrower placement.
4: Nice one! Getting the laser blaster to prevent the climbers from turning around at the plant was not obvious and took a few tries; I guess the trick is to use the laser blaster a bit further left. For a moment I was contemplating another solution, setting up a soft catch for the crowd with a bomber from the other side of the cans, but getting the climbers back would have been hard or impossible. 9: Kind of a combination of the first and the second backroute. Could this be intended? (There's an extra image in the folder on how to separate a single lem from the crowd, even though I didn't need it in the end.)
10: Did something similar, with a pixel precise setup. Using a mortar to make a dent in the long cliff again (not pictured).