Here's a short set of quite enjoyable puzzles from mxvladi.
There are four paths here, leading to aumtlich, fegundo, adder, and goblin puzzles. Along each path, each puzzle uses a very different trick from the one before, but generally focused on the fine manipulation of each type of monster. The puzzles were just the right length for me, meaty enough to showcase the idea but not so long as to become tedious. Very nice effort, mxvladi!
Once the player chooses a path, force arrows and doors force the player to solve all the puzzles on the path before returning to the hub room and choosing another path. This didn't bother me, but may be a disadvantage for less experienced players.