Doctor Who - Worlds in Time

How spoilery is it in terms of the show? I'd love to try it out, but I have to catch up first.

It's not spoilery at all. Familiar enemies/locations show up, but apart from The Doctor and the Tardis, the story is completely new (and yes there is a story, quite a few of them actually)

EDIT: Oh holy crap, the difficult really increases suddenly on the plant Ember (the one in the screenshot) when you reach level 5, i actually failed a mission D:

Probably gonna stay on Earth for a bit longer.