What a great game for the jam! The story and characters are really endearing and do a great job incorporating the theme into the presentation and gameplay. I'm sucker for platformers, so I enjoyed the gameplay a lot as well.
However, I do still have some critiques: First, the platforming feels too claustrophobic at times, especially in areas with 1-tile vertical gaps. The character/wall hitboxes could definitely be more forgiving. Alternatively, you could implement corner nudging to help prevent the player from catching on the walls during tight jumps. Second, there are a few sections where the camera switching between adjacent rooms is a bit jarring (specifically, any areas with consistent vertical movement between rooms, like the area with the springs and moving platforms). I wonder if it would make more sense to implement a smoother camera that moves with the player?
To be clear, this was still a fantastic experience for me, and I'm really impressed by the level of polish and character that's on display here! Amazing work!