It's just slow. There was so little to the plot that the director had to stretch out each scene until even the action seemed slow motion. The camera work as noticeably stiff and fixed in many scenes. The acting by the main protagonists was uninspired, but consistent.
The concept of whether Michael Ironside's character is the devil, or merely one of his overconfident myrmidons, is vague at best; as are his motives. But then one seems not to actually require motives in a horror film. It isn't something I fret about.
Still, Night Trap has some qualities to recommend it. Robert Davi, stone-faced, and purposeful, is interesting to watch as a cop who is just not quite the classic loner/rebel. John Amos is there too, but his performance is much too understated. I kept watching for him to fall asleep. Michael Ironside is more or less wasted in his part. He just struts around most of the time, and occasionally makes some threat or pejorative pronouncement in a stentorian and rather flat basso voice. The supporting cast did a good job though; and their characters were engaging. Everyone comes together to work out the meagre plot in a way that makes the film at least good escapism; and weak but reasonable horror. I'll often watch it if I see it come on cable. It's one of those "guy" films for when you just want to lean back in the recliner and escape for a while; and perhaps take a nap or two. If only it moved a little faster.