This game was extremely hard, but I persevered and am glad I did, because otherwise the "chain reaction" part wouldn't have made any sense. It seems over half the story, including the part involving chain reaction, is at the very end. I fear with the difficulty most players won't see that, or the cool progression you have for the story. I would like to see more of your story than the gameplay personally.
For controls, the player slides a LOT. Even the tiniest nudge sends your character sliding like they are on ice. This makes a lot of your precise platforming extremely difficult. But aside from that, being a simple Celeste inspired game was fun, as I love Celeste. Though adding a unique spin on its formula would have been nice to see.
Your art is amazing, and the writing was gripping once I got to see all of it. Well done! If you have more story planned, I would love to experience or read it!
With a bit of adjustment this has a lot of potential!