I can see why the blurb compares it to Trick 'R' Treat - this movie is very much in the same spirit. An anthology of ten stories of mischief, mayhem, and murder all taking place in the same town on the same Halloween night, with some minor interconnected bits between the stories; it sounds pretty much exactly like the former except for the number of stories.
First off, a word of warning: do NOT go into this expecting a scary movie. Aside from a few jump scares, some freaky-looking creatures, and one particular segment of the anthology, there's not much here to terrify or creep you out. This is very much a B-grade horror-comedy; expect something more like Sam Raimi's Evil Dead movies or Cabin in the Woods.
There's plenty of gore to be had in this one, so if that's your cup of tea, you'll enjoy it. However, those put off by excessive gore will probably flat-out hate this movie.
As with many anthologies, the quality is kind of a mixed bag in terms of the writing, direction, acting, and plots. For what it's worth, none of these stories struck me as particularly bad. Standout stories included The Night Billy Raised Hell, which, aside from being a wonderful exercise in black comedy, actually pulled off a nasty little twist; Friday the 31st, a hilarious blood-soaked battle between a Jason Voorhees knockoff and a trick-or-treating alien; Bad Seed, the story of a Jack-O-Lantern come to malicious, murderous life; and Grim Grinning Ghost, which is good at using its limited runtime for building tension, and is the only story in this anthology likely to elicit a scare.
References to classic horror are all over this movie - the most obvious one being Adrienne Barbeau's performance in The Fog, but there are also nods to the aforementioned Friday the 13th, Halloween, The Thing, and more, in addition to actual cameos by a couple of horror legends.
Like I said, don't go into this expecting a horror movie. But if you're craving a Trick 'R' Treat-esque anthology about Halloween featuring tons of gore and dark comedy, this will satisfy your sweet tooth!