I've been playing your games for a while, and I have to say you really delivered here.
Most of all, the presentation is super great, the animation is fun and the sound design super satisfying, especially when it comes to the interactible elements. Spécial mention to the bells which hit just right. When you realize you are taking the wrong approach and have to rethink it, the bell is perfect for giving you a little distraction to reset your thoughts, and it manage to both be relaxing and hit a bit of dopamine, perfect stimming. I kind of found myself wishing it was always available.
The menus are super neat, and hiding a puzzle in them for unlocking the bonus levels made for perfect immersive interaction, both visually interesting and good at making you feel clever.
My only gripe would be that i didn't like having the choices in where the rails connect when ther multiple already placed be timing based. Made it feel clunky as I ended up having trouble connecting my rails correctly a few times.
Also I didn't interact much with rush hour but that's more on me being the slow thinker kind, so just not my own jam. But I see the appeal.
And finally, SPOILER there (just in case):
The final letter really hits the spot, it's an excellent use of silence for capitalizing on the emotion.
In short, your experience is really showing here.