i did it! i'm a little blown away, this is really well done! some of the qol stuff you've mentioned in other comments would be good, but WOW this is already really solid.
i do like the ending, but the abruptness of the last sentence caught me off guard. "and then you realized." ...realized what? the mirror, or something else? i wasn't sure if the game crashed before the actual last line, or if that was it. i think maybe omitting that line entirely might help it feel better? or maybe cutting to a glitchy credits screen before closing the game--something that still feels like a crash, but also comes off as more intentional.
i did go back to replay and check if the "exactly one solution" promise held true... and i found a second way to do it? i found two ways to kill the pc in instance #1, and both of them worked for the final solution. not really a bug or anything, but i wasn't sure if this was intentional or not so i thought i'd make a note of it.
i love the look of this game--it feels equal parts trippy and retro. very well done. the music was very pleasant, and i like your interpretation of the theme a lot. i'm also partial to time loop games, so extra points there. this is one of my favorites so far!