Really fun idea. I kept trying to beat it, but only ever got to 11. My advice would be to either make it a lot easier or make it a lot tighter. Right now many deaths feel like nonsense, and I hate that.
For example, the thing where you can (and in some cases apparently must) go a fair distance into the floor/ceiling, but you can't see the limit of how far you can go before you die? The game is hard enough without having to guess where you're going to die.
Fast pendulums that come out of nowhere need to be foreshadowed somehow. Maybe a sound, I dunno.
The colliders needs to be closer to the models. Sometimes you can go through the edge of the cogs, sometimes you get hit while not even touching them.
The death sequences are great, but need to be skippable.
I'd put the checkpoints more frequent, too. Having to constantly redo a section I barely beat once because the next part kills me, isn't fun.
Kept me playing, I'll give you that. Love the aesthetic.