I have just tried it and the game is excellent, and so funny! Plus, I love the concept and how they turn things around so that you must die instead of winning a level alive. I enjoyed Karoshi 2 the best, with Super Karoshi coming a close second! I also love how they throw lateral puzzles, cheap tricks and jokes inside them (particularly the ones in Karoshi 2, where they trick you into thinking the game is over, when it's not).
I wish the Custom Level Editor in Karoshi 2 was fully customizable, though. Not just adding spike traps, but adding special effects like changing the background and tiles, adding water/slime/lava, making sure that the guy does not touch any blue buttons, etc. Other than that, these games are excellent!
Interesting note: The guys in Super Karoshi that you must also kill seem to behave like lemmings. Also, the game's rules as a whole seem to be the opposite of Lemmings.