We're aiming to create a game conceptually similar to the original Flappy Bird, but with different visuals. It's unimaginatively called Kivy Bird. The end result is depicted as follows:
Kivy Bird gameplay screenshot
Let's take a closer look at the game and dissect it into logical parts, creating a project outline that will be used for development:
Background: The scenery consists of a number of layers moving at different speeds, resulting in a neat fake depth (parallax effect). The movement is constant and not related to any game events; this makes the background an ideal starting point for the implementation.
Obstacles (pipes): This is a separate graphical layer that also advances towards the player at a constant speed. As opposed to the background, the pipes are procedurally adjusted to have different relative heights, keeping the gap between them passable for the player. A collision with a pipe ends the game.
Playable character (the bird): This sprite moves only vertically...