This game is really pretty and has wonderful music! This game definitely has a lot of potential, I love the atmosphere of the game and the art direction in general, however I do wish it was a little more user friendly (especially for first time players)
For more specific feedback: I agree with the commenter before me, the train scene gave me a pretty bad motion sickness, I think it would be nice if the parallax or camera shaking gets toned down a little or decrease the number of layers. I also wished that somewhere in the game itself, they tell you about the special mode (Maybe the fella on the tree can tell you that? He is our guide after all) Otherwise I wouldn't have known what to do. I also had a lot of difficulty climbing back up to reach the water pipe and it left me quite frustrated (I never managed to climb back up there) Maybe consider making the slope gentler/build a different collider/ground instead of using the foreground image?
(Also a little nitpick from a fellow artist: You guys might want to increase the alpha cutoff on the sprites because i can see some white pixels around some of the assets, especially on the main character. Would also love it if there was something indicating that I can interact with an object, maybe an outline, particle effects or even just colour coding certain items to make them stand out a little more from the BG)