Nice level here! Looking back, I don't know why I struggled with this level too, as, at least for the left set of pickup skills, it turns out I simply missed building one staircase so that I can send another lemming over the top, as otherwise only a climber can go through the top. I think it's because I was too focused on making sure that no one else would fall and get trapped at the bottom. Not to mention that it might had been a waste of a builder otherwise. Nice job tripping me up with the red herrings
Here, I don't know if this is a slight backroute, as I ended up saving 1 over the requirement
I think I will try and find the second intended solution with the set of pickups on the right off-camera. I've also pointed it out on Discord, but the track for your R3 is super loud, to the point that it can potentially be deafening. I'm not sure if there's anything you can do on your end to make it softer, though, but for the player one could simply reduce the device's volume.