The Adventures of Lomax is a spin-off of the Lemmings series. It contains good music and graphic but also an insane difficulty (mainly due to bad hit-box detections).
Here is a
WIP of the first two levels (
Youtube).
The two main difficulties are the managements of the bridge building ability and lemmings.
Bridge building ability can be use to reach inaccessible (with your normal jump) places, but you can only use it 5 times between each refill and these refills are not common.
The other problem is the lemmings rescue. Each time that you rescue 50 of them, the level exit send you to a bonus round, and this cost between 5 and 10 seconds. That's why I must try to kill the fewer enemies I can (for this reason, I will maybe have to redo the first level, but the game seems to be hex-editing friendly).