Make a lemming a rock climber and time it so that he falls directly onto the chain, without jumping.  He needs to be released such that he is flung all the way to the right side of the level and bounces off the right wall (keeping him from climbing that wall).  From there, jump over the gap and pray that he drops off the edge just as the chain is arriving; you can assign the jumper early and climb up a bit of the side of the gap to help make the timing more favorable, but it still takes some finagling with the chain speed.  Release the lemming to the left and have him laser blast to the far left edge of the crowd's holding area.  If luck holds, no right-facing lemmings will be directly over the laser when it breaks through, and everyone will walk left to the exit.

Tense

1 - Behind Schedule

Great level, my favourite so far. The solution is pretty well-hidden. I knew the use of the climber would be key, but it took me quite a bit to see how it's done.

2 - Lucky Brick

At a first glance, I thought this would be a hard level. But I was wrong. Just a floater that builds a long bridge to save the crowd from above. Very atmospheric music here.

3 - Going down

The easiest way to do this is by increasing the Release-Rate to the maximum immediately. In this case, the digger is far enough down to make everyone land safely when the crowd arrives.

4 - Operation Hatchling

Second iteration of the egg-level,  this time with a different skillset. Only floaters, builders and bombers are available. This level is not particularly hard, but still some precision is necessary. Also, no Lemming from the splat-hatch is allowed to die.

5 - Polar Vortex

A typical example of a traditionel Worker-level. Since 100 percent have to be saved, the blocker has to be freed in the end, but thats the only minor challenge here. Nice tune!

6 - Pause and Ponder

The Lemmings from both hatches must be saved through the same exit otherwise the bridges run out. Apart from this, an easy level. Terrain-removing skills are more than enough available.

6 - Meet in the Middle

What a splatfest! The main part in the middle can be a little bit tricky to execute. Both Lemmings have to walk to the right in the end. This means, the left builder has to start his bridge a little bit earlier than the Lemming at the right side. Nevertheless, a good level!

All my solutions can be found here: https://www.youtube.com/@Swerdis