That's awesome we had similar ideas. I had planned to have the mother at the end give lots of crazy responses based on what the player collected. Didn't have time to do that though.
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I wasted too much time while searching for assets so ı had to change the story of the game. Also forgot to write but loved the camera getting farther from player as train got longer. and the objects had still their colliders enabled after being added to the train adde a good effect when zigzaging between builidings.
Thanks for noticing the zoom. It's kinda subtle and easy to not notice if you are focused on collecting the gifts. I had some issues with the zoom because I initially had the pixel perfect camera component setup on the main camera I was happy with that, until I realized the zooming would not work because it would break the resolution pixel ratios... So I had to disable it.