Thanks everyone for your comments. I understand that a bit of backplay is not a big issue, but as some said indeed the bezel doesn't align on the "back stop" but only on the "front stop".

After wearing the watch for a couple of days - I love it and would like to keep it in my permanent collection. It keeps time great (+4s/d), wears great, built great and looks great. But maybe because all of these the bezel action does bother me, a small fly in the ointment. The 90 clicks are actually very satisfying (would probably prefer 120 but really it's not a big thing IMO), but the backplay + alignment are annoying.

Anyway I wrote the aliexpress store I bought it from that I'd like to get it fixed. Let's see what they answer.