It's the usual stuff about the customer being responsible for everything and they can change the terms at any time without option to accept or reject them. But beyond that it also appears to say that you're responsible for using a smartphone that supports their app. Given they can drop support for a device at any time, this has the potential to lock you out until you get a new phone.
I'm also not sure about their use of biometrics for security. I wouldn't use an ordinary front facing camera to unlock my phone so why would I use it to secure my bank account?
[0] https://www.atombank.co.uk/application-terms-and-conditions