What is it?
The 2018 psychedelic action horror movie Mandy.
Here is how The IMDb describes this movie:
The enchanted lives of a couple in a secluded forest are brutally shattered by a nightmarish hippie cult and their demon-biker henchmen, propelling a man into a spiraling, surreal rampage of vengeance.
Taking place in 1983, Red is a lumberjack who lives in a secluded cabin in the woods. His artist girlfriend Mandy spends her days reading fantasy paperbacks. Then one day, she catches the eye of a crazed cult leader, who conjures a group of motorcycle-riding demons to kidnap her. Red, armed with a crossbow and custom Axe, stops at nothing to get her back, leaving a bloody, brutal pile of bodies in his wake.—texasboyy