The good news first: cinematography is nice and colourful and film has that 1970s classic, stylish feel. But the bad news outweigh the good: almost nothing happens in this movie!
Spasmo is a horribly boring snoozefest that I cannot recommend to anyone except Umberto Lenzi and/or giallo completists!
UPDATE 2024-08-18: I just watched this movie again. I guess I was too high on weed when I first watched it. After second viewing, I was impressed: The plot is very strong and the movie was beautifully shot. Good music by Ennio Morricone. There is very little violence in it, but it is a very good movie! Recommended for fans of thrillers!