Amazing! Love the premise and the overall idea :) I wish there was a way to quickly restart -- I had to press escape and play the whole thing from the start. Love the look and feel to the game, I think the mood is very on-point.
Spoilers:
I really like the bumpy floor and the pit filled with broken pins (that was a very nice touch). The music also set the mood really well, and I like how you use the light to guide where the player should go.
For the first few times I tried this game, I spawned outside the starting area (after hitting the 'bowl' button) and just fell off the map and was just confused. Not sure if you need to reset your momentum or set the position or what not.
I played the game up to the 3rd room, but found that it was too frustrating to keep going past that. I know y'all put in a lot of effort into this game, but sometimes players just get stuck with the smallest part of the game and quit. I think it's okay for a game to be brutal, but I think there are definitely ways to make it feel less frustrating. For instance, Celeste immediately spawns you at the start of the specific screen on death and makes sure you can quickly get back and try the game again. When the screens are so small, the player can learn from their previous death and can quickly apply things like jump here earlier, dash up this way, etc. I think you were going for the Souls-vibe and that's why you set the spawn to be the campfire, but sometimes you have to make the choices between the mood/theme vs game-feel or gameplay loop experience.
One other thing is to put more difficult maneuvers closer to the start rather than at the midway point. In the third room, I found jumping off the rotating platform to be super hard, because I couldn't feel like I could predict the movement of the ball when the the floor is also spinning. This isn't explicitly bad, but the walk back to that jump really added to the frustration :( It's hard to design a game to be challenging rather than frustrating, but these little small things really help.
One other option to explore that switches the mood of the game greatly (which may not be what you want) is to provide more agency to the player (i.e. adding jumps, dashes, or making it easier to switch direction/momentum) . Being more in-control of your movement option makes the player feel more responsible for their death (rather than end up blaming the game for it). It's very much a perception thing (because at the end of the day, it's objectively the player's fault), but the line between "oh darn i was so close, let me try that again" and "dangit this game asdflsakfjlskdajf i'm done" is very thin.
But then again, these are all my opinions that were molded by my favorite game of all time (Celeste), so other types of gamers might find this challenging instead of finding it frustrating (which I did). Maybe you wanted a frustrating experience and then that's okay, but it was just too much for me to try to get to the end of the game.
Other small things to keep in mind is how dark you make the levels. Although it does really contribute to the mood of the game, don't forget that everyone's monitor/set-up and eyes are all different so things that are super low-contrast can be hard to identify for some players.
I think it can be pretty disheartening sometimes to hear folks get stuck on the smallest part and end up not experience all the nice parts of the game you designed. However, this is something that pretty much all game devs run into (seeing streamers skip through all the nice parts of the world I designed wasn't fun to watch either, but oh well). Over time you'll learn what to catch early on and you'll build a wider game designer toolkit to apply to your levels.