Being limited in the number of ghost you can make, and the fact that that using certain death spots blocks the makes this a more interesting looping death puzzle.
I kind of wish the timer was more precise for planning the more complex loops.
There's a minor bug on the web rendering that makes the "E" prompt look like an F. (I think the bottom line of pixels gets cut). It's probably worth just doing a small patch for that so you don't get stuck if you didn't read the instructions properly.