It’s quite a test of endurance, patience, skill and luck as krille71, as known on YouTube, ducks and dodges around enemies without killing them. It’s trickier than it sounds too as it requires careful placement of bombs or, as you’ll see, the foresight to move a pot before you plant a bomb. Of course, that doesn’t mean that no creature was killed in the making of the video; sometimes you have to strategically steer them into traps.
There is some speculation as to whether this run could have been done with fewer kills. After all, krille71 does kill the bosses to proceed. And we thought Spelunky was difficult at the best of times! Ghandi would be proud.