I actually went to a theater to watch this play, at the insistence of my girlfriend at that time. So it was about 50 years ago. It was in French, and most probably the original, not a translation.
What I remember best about it is that I did not like it at all. Besides that and what I put in the title I remember almost nothing.
It was mostly a "huis clos", as we say in French, a few people in a closed space, but not the play with this title by Sartre. IIRC, just a married couple, plus a corpse of which one sees only part of the legs, which increase in size from one scene to the next one.
I use the tag "horror" to mean fantasy since it is definitely not SF. But I found it more boring than frightening. Well, horribly boring, maybe...