Right. So. I don't know guys. This wasn't a bad episode. It just wasn't great. Honestly I think the main issue was the pacing. This episode felt very slow. It was a very different format from normal episodes, which normally I like when shows do. This episode though, not so much. I liked the story we got at the beginning, and the number of aliens was cool to see. There was just a lot that I feel like didn't make sense, even for Doctor Who.
Like the who "objects of sentiment" as currency. Say I pay for something with a necklace that means a lot to me. The person I gave it to won't have any emotional attachment to it. Can they still use it as currency? I just didn't get it.
Also, I realize that Clara said the TARDIS didn't like her. At first I thought this explained why at first, the song wasn't being translated, but later was made up of words, it took a while for the translation matrix to kick in. But Clara had a conversation with the little girl before the song started making sense so I don't know what was going on there.
Maybe on rewatch I'll like it more because I'll know what to expect from the episode.