I don't think this necessarily the most unique game (I have seen others along the same lines) but this is outstandingly well executed. It seems like a small thing, but I think adding a short story portion at the start makes the game feel much more special. I understand that you didn't make all the music yourself, and you credited the producers which is nice, but I liked how the music paired with the tone of the story and game. I think the strongest aspect of this game is the level design. As I kept playing, I started to notice how the stages mirrored each other and so the solutions to the puzzles became more readily clear over time. I do wish there was another mechanic or two to spice this up, but I think its awesome that a solo developer was able to put together such a complete, polished product.
If I had to suggest some new mechanics, I would suggest things like intermediate portals that take you from one place in the level to another, to spice up levels. I worked on a top down game for the 2022 Global Game Jam with a similar theme and ideas that had the portal mechanics I am talking about: https://globalgamejam.org/2022/games/superpositioned-4
I am happy to playtest any new builds if you continue developing this game at all.
I would also really appreciate it if you could give me feedback on my game jam submission as well.