The show itself looks to be a mix of key parts of Poltergeist and Silent Hill with better characters. Rewatched Poltergeist a day or so ago to find three people in the family even look close to Stranger Things family. Especially the boy. So, I thought it was a tribute to those or tapping into recognition of them. Without spoiling, the ending was great, too. Lots of producers seem to give middle finger to audience with how a season ends these days. That ending could be a decent finale or allow for another Season. Right way to do it.

The opening is great. I marathon watched them but still enjoyed seeing opening each time. I agree with OP that it's refreshingly simple. Agree with you the music is like 70's or 80's style mixed with what I'd describe as common, background music for building suspense or interest in what's coming. Visuals for large letters and coloring were neat, too. I want to see more like it.