Thank you for the feedbacks! Very appreciated indeed!
This is my first attempt at using Godot (or any other game engine anyway). From my previous experiments, I was used to a full-coding approach with MonoGame. So, most probably I didn't leverage all the functionalities coming from the engine.
As to the sprite movements: behind the scenes, the x coordinate is moved from a cell to another with a time based increment. On that coordinate, I've applied an "ease out back" function by using this Easing Functions Cheat Sheet. Hope this helps :)