I also watched the series recently and didn’t see anything wrong with the ending. But I was told to go in with no expectations of things being entirely explained, so for me, I just accepted that the island was an unsolvable mystery and enjoyed the other parts of the plot. It was a great show IMO.

I think you can go find the video in an incognito tab, then grab the link from there

I really enjoyed it up until the end, where I knew exactly what needed to happen, but I couldn’t figure out how to do it. When I finally looked it up, it was the most unintuitive solution that felt more like an easter egg than the intended path. I would have never finished it on my own, which left a bad taste in my mouth.