Premise was very interesting and I was gripped from the start. However, it became obviously that we won't get any progress when it comes to the story about universes. Story revolves around main characters and very little is developed besides that. I was disappointed they didn't use guest actors for anything more than pure fan service. Also, things that were changed in other universe could've had more purpose.
I was expecting more from side characters in the end and not necessarily in romantic area. I am alright with not knowing their stories after returning in main universe, but all other relationships and connections felt unfinished.
My biggest pet peeve that repeats through many series is wiping each others mouth or face, which is clearly done in multiple takes, where wiped substance mysteriously disappears.
Many scenes with leads felt repetitious and didn't bring story forward.
Overall, I can accept it for what it is, but wouldn't necessarily recommend it.