Hello! I was introduced to SuperLemmini by Psychedelic Eyeball's new let's play and have been having lots of fun with it!
I came here to report some odd behaviour that may be bugs (replays showing them off attached).
In Taxing 4, "Lend a helping hand...", I've met failure in two different ways trying to mine a pillar near the top of the screen. Once the lemming mined nothing, went right through a staircase and fell into his death. The other time he made a path and exited the level, but left a pixel wide part of the wall keeping the other lemmings from following him.
In Bonus 8, "Don't make the wrong choice!", the exit seems to be a little above the ground. Thankfully I had an extra Builder, but it seems odd that I needed it. I've only seen the Sega Master System version of the level, which differs in some significant ways, so apologies if that's intended/replicating the original.
Thanks for the hard work so far!