I see some people complaining about this series being slow, however, that's the idea: An ordinary guy realizes he can travel through parallel universes but he is neither a scientist nor he's read about time travelling in his whole life. How on earth would he rush on things? Do you want him to have some powers and by changing one thing being a renowned genius? Sorry, but we have a normal skilled adult man this time!
Anyway, after some "trips" you get kind of mad because the MC doesn't seem to learn from his mistakes. Had I been the scriptwriter, I would have increased his IQ a bit .
It's wonderful when a "new" story starts in other universe because we have to pay attention to every single difference and details in situations, things and characters personalities.
I highly recommend you don't watch this show dubbed but subbed. It's much more enjoyable (and totally different) with the original voices.
I've seen plenty of parallel universes and time travel stuff such as The Butterfly Effect, Mr Nobody, Star Trek, Steins;Gate, Life Is Strange (this is a game) and I have to say this is at the same (and sometimes even a higher) level.
Just be patient with the overused and kind of everlasting drama, it'll all make sense and you'll get some single-episode-cliffhangers which you will either hate or love! LOL