Could have been much better (Spoilers).
Firstly, it's been done before in the episode Parallel Monsters from V/H/S Viral.
Secondly it doesn't follow its own rules. At one point the female lead can't travel back to her world because the pod on the other side is broken but later she is able to send her evil husband to Hellraiser 2 world which doesn't have a pod on the other side. He just appears on a stone slab.
Lastly I didn't like the ending which reeked of Back to the Future's ending.
6 out of 10. It's a shame it didn't taken more risks and had more extreme alternate realities. It felt too much like they played it safe to avoid confusing anyone. They focused more on the family story side of it which was a bit boring considering the opportunities they could have had with different dimensions.