Such a fun and beautiful game!
I like the art style and overall look/vibe of the game. The audio design is also amazing.
To answer your feedback questions:
The gameplay feels good, everything is very clear. Everything is working as expected and the core gameplay feels very polished!
I don't think the game is too difficult. The must-do tasks are pretty easy on their own.
The nice-to tasks add some more difficulty to the game, which is nice because players can choose if they want a challenge or not.
I see you might add animations in the future, animations could help bringing your environment to life.
However for your character animation, I would just stick to a simple idle animation.
I like the jumpy movement of the characters, adding a walking animations would ruin that.