(realizing this is veering off into tangents of tangents)...
An idea I discussed with someone tossing story ideas about was regarding the reliable / unreliable narrator for a mystery mixed in with being able to view (lock a display screen to a geographic location, got a knob to rewind / fast forward time (up to the present)) immutable past events who finds something amiss. Upon the "somethings not right..." the narrator reviews their own events of the previous day and finds that the events don't match their memory. Is the narrator reliable? Is the narrator that is questioning their own reliability the narrator or an external agent trying to cast doubt on the reliability of the actual narrator?
That does sound interesting--to give the reader a bit more tooling to decide whether they're being lied to and by whom. You might enjoy The Quantum Thief, which isn't published in a such a unique way, but which has fun a story that would fit right in.
An idea I discussed with someone tossing story ideas about was regarding the reliable / unreliable narrator for a mystery mixed in with being able to view (lock a display screen to a geographic location, got a knob to rewind / fast forward time (up to the present)) immutable past events who finds something amiss. Upon the "somethings not right..." the narrator reviews their own events of the previous day and finds that the events don't match their memory. Is the narrator reliable? Is the narrator that is questioning their own reliability the narrator or an external agent trying to cast doubt on the reliability of the actual narrator?