It's always fun to discover old sci-fi like this. What viewers need to understand is that this was shot in 2 weeks on a $250,000 budget as part of an experimental PBS project. When you consider how much this film is able to convey with so little, one cannot help but admire it.
My god, who added this? Just saw it recently and it impressed upon me greatly. Can't say that it was great, but memorable, yes.