This Dunedin duo made two collections of ambient music. One says all sounds are piano and field recordings, and the other sounds like it could well be the same. Giles Thacker is another alias of the musician you may know as Fuckault.
We, The People, Refuse To Exist (2016) is the explicitly piano one, apart from the submerged vocal on closer “We Expand Us”.
Giving Birth (songs to be listened to quietly) (2017) has fewer but longer tracks.
Fuckault Bandcamp page (contains both albums)