Odd film, but I love it. Halloween I & II completed the Michael Myers story. Then III was a totally new thing. The intent was to make an anthology series, but no, dumb people just wanted more of Michael; I think all subsequent "Halloween" films are irrelevant and stupid (OK, I do like the Rob Zombie movies). I was a spooky monster kid, but still wasn't allowed to watch the first two at the time of their release, but somehow H3 at 12 was OK. The soundtrack is one of Carpenter's better mood pieces, not as iconic or repetitive as the first two; people sometimes forget Carpenter's as much a musician as a filmmaker.
Plot & characters of the film remind me strongly of The Stuff, Phantasm (especially II-III), and Killer Klowns From Outer Space; losers struggling to expose some terrible danger to Humanity, mostly failing and running. That's what Lovecraft was on about, and how every Call of Cthulhu game should be, not gangsters throwing dynamite at Shoggoths, but truck drivers and kids running for their lives and coming across as crazy people to the useless pigs.
"And don't forget to wear your masks. The clock is ticking, it's almost time! Happy happy Halloween, Silver Shamrock!"