It can be watched online from the Internet Archive:
1000 Misspent Hours says it "is quite effective for what it is". Moria says it is
a gleeful black comedy which happily jibes at the pretence of the Beat Generation. It’s amusing, although the script is told with a minimalist economy that brings a smile rather than a real laugh.
5/13/2010: Great Old Movies blog calls it "an effective black comedy".