[Solved: The Entropy Centre] First person time manipulation puzzle video game inspired by Portal
It was released a few years ago. It's not Singularity and not Timeshift.
The title was short, two or three words, and I'm pretty sure it was some kind of physics technobabble.
The game follows the Portal formula where the player has to solve a sequence of self-contained cube-and-button challenges in a decaying facility, except it's on a space station. The player has a device that can reverse time and cause the cubes to retrace their paths through space. The act of solving the challenges somehow generates energy. There are friendly robots with faces drawn on sticky notes. We also see the Earth explode.
The Entropy Center?
That's the one, thanks!
(edit) It's also sold at a 70% discount on GOG. https://www.gog.com/en/game/the_entropy_centre
Q.U.B.E.?
Edit: or "The Turing Test".
Similar time-travel.
The Citadel game mod for luanti(previously called minetest) has time travelling puzzles around an old ruin.
Free forever, no spyware.
Here is the (Major Spoilers) gameplay video - full playthrough