Agreed with the others about more variety being nice, but the repetition did lead to a good anticipation for the strings to come in, which added a slightly different rhythm and feel that was sort of eerie which I quite liked.
I also really like the ending, but I do think that if you had ended it just little earlier (~3:25) on the home note it might have felt more satisfying. But as it is it leaves it a bit more eerie, which is nice as well for the theme