I played through the levels and I liked them a lot!
In general I think the puzzles were pretty good difficulty, and the execution was what's pretty normal for Lemmings 2. I got the intended solution on most of the levels, but I did find a few backroutes.
Level 1: This one was pretty simple, and straightforward, but nice to play.
Level 2: I actually really liked this one. At first I tried to get something going in the left half of the level until I realized the correct route was going around the right side and coming up with the laser blaster. The way the basher makes the perfect glueing platform is really nice.
Level 3: This one's pretty simple once you realize that you can't get over the block without the roper.
Level 4: I think I got the intended solution on this one, but I did save a sand pourer and magno booter.
Level 5: This one was pretty straightforward.
Level 6: This was a pretty nice puzzle! At first glance it looks simpler than it really is. This one should be possible with 3 sand pourers, but I think adding one or two more would make the execution a bit easier without changing anything.
Level 7: I liked this one a lot. Great puzzle that feels like a good Lemmings 2 level, and plays well.
Level 8: Pretty sure I backrouted this one. My solution was extremely straightforward and didn't use the teleporters at all. I was able to let only one lemming slip past the miner by using a platformer, then made that lemming slide down and platform, and cancelled the platformer with the other miner. I guess I used most of the skills, but it doesn't feel like the right solution.
Level 9: I might've backrouted this one. I saved the laser blaster, a climber, and a floater, but the solution doesn't feel wrong, really. I'm guessing I took the same route as was intended, just saved a few skills along the way.
Level 10: I liked this one quite a bit. Once you realize the magno booter has to go around the solution falls into place. I did find a backroute which saves a stomper and the sand pourer: after you bridge to the exit you use the stacker and build back to the steel. The lemmings will easily survive both falls.
Overall I really liked this pack. Liked you said, it wasn't too difficult, but I think it had the right amount of challenge to be fun.