The kids make this an entertaining film with fun pop culture references, it's very character driven. The Afro American kid Dariush is funny . The effects are not top tier, and they don't need to be. they are serviceable to the plot, a bit drawn out in the third act.
I know a few of you had an ok time with this, but it didn't work for me on any level I'm afraid. Very iffy acting from the lead kids, not to mention a chemistry vacuum, and nothing like the level on display in Stranger Things. Nothing gelled for me, not the poor creature design, naff effects, and laughable journey the characters were on. And don't even get me started on the ENORMOUS Jurassic Park rip off on the kitchen!
Netflix at it's most bargain basement, but easy to comprehend when you consider McG also brought us Charlie's Angels : Full Throttle.