There's a lot of good in here, so it's probably quicker for me to just say the things I didn't like about it, and you can just assume everything else was great, and I'll shoutout the bits I loved most.
The music was a bit too repetitive. I think most of the games could have been fine with this music, but the fact your game has (comparatively) so much content means the music had a bit more time to grow stale.
It feels like it could have benefited from being just a little bit faster (especially the moving platforms)
It felt a lil' weird having the game as polished as it was (you even had footstep sound effects!), but then for the big bloody sacrifices to be so quiet.
There was a visual bug of somekind where I could see the sky for a split second behind the bits where one ground tile ended and another one began? Just these lines of blue going through the ground.
Asides from that, the art was great, the platforming movement was well done (particularily happy that nothing bugged out when I put myself between the roof and a lift going up!). I am so happy there's a save game system. The real crown though was the level design. So much decor, nothing about it felt rushed, and I had a habit of always winding up in the right place, so I feel like the level was directing me really well.
Well polished, thematic, fun!