Absolutely amazing. Played all the way through the credits as well! 2 of the main mechanics are actually very similar to mine, that being the toggleable mechanic (gravity) and level completion (going through door) so it was pretty interesting seeing how you did it compared to me. Of course you had the teleporters as well which made this game so much more fun!
Only thing weird I found was that after the credits my screen was black. Maybe just add a quick button to bring you back to the menu (unless I'm missing something because the game didn't actually completely fit on my screen). Also some of the spike hitboxes in the earlier levels felt a little too big and I would die when I didn't think I should.
Level design was incredible, the narrator wanting to kill the player was super engaging, and graphics + audio were great as well. Really nice job. Added it to the list of games I would play again!
I don't wanna be that guy but I've been looking for more feedback for my game but I've only actually gotten a few pointers haha. It would mean a lot if you guys could give me some proper feedback!