Thanks for the feedback BulletRide
Here's an updated version with small changes to levels 1, 3, and 4.
Yup, those are back routes in 1 and 3. Your second replay for 1 is spot on though. I just added a bit of steel to block the back route.
Glad you liked 2! I had Arty playtest this a little on one of his livestreams. He seemed to like it too.
For 3, after rearranging some things, I figured I had to get rid of the blocker.
I really liked your solution for 4, but an important part of the level was skipped. I thought about leaving in your solution cause I liked it so much, but I really like that skipped part too. If you play version 2, let me know which version was more fun. For the newer version, crowd control shouldn't be as annoying, but if it still proves too irritating, I'll decrease the number of lemmings.

Spoiler
Yup, those are back routes in 1 and 3. Your second replay for 1 is spot on though. I just added a bit of steel to block the back route.
Glad you liked 2! I had Arty playtest this a little on one of his livestreams. He seemed to like it too.
For 3, after rearranging some things, I figured I had to get rid of the blocker.
I really liked your solution for 4, but an important part of the level was skipped. I thought about leaving in your solution cause I liked it so much, but I really like that skipped part too. If you play version 2, let me know which version was more fun. For the newer version, crowd control shouldn't be as annoying, but if it still proves too irritating, I'll decrease the number of lemmings.