This looks great! I love the idea of exploring the theme of greener transportation and longevity of vehicles, through your journey as a cat.
The scope seems reasonable, depending on how many puzzles you envision. The block puzzle is a solid mechanic to iterate on, however I was wondering if you had any idea in the onset as to how the game would evolve, outside of just the narrative development of talking to different animals along the journey.
Deciding to do this in Godot is also quite commendable. I myself have been looking at the engine, and trying to jam with it is probably the best way to explore and get more familiar with it.
Excited to play the project!