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link:https://setapolo.github.io/PaMa/eHOxFPkFYJ4.html
This p5.js sketch is a basic implementation of a Galaxian-style shooting game.
The player is defined in the Player class and can move left and right using the arrow keys and fire bullets with the space key.
Enemies (Enemy) move horizontally, reverse direction at the edges, and gradually descend, following a movement pattern.

Bullets (Bullet) can be fired by both the player and enemies, and they are deleted when they go off-screen.
Collision detection is handled in the checkCollisions() function, which compares the positions of all player bullets (bullets) and enemies (enemies).
Specifically, it checks whether a bullet's coordinates fall within an enemy's rectangular area. If they do, both the bullet and the enemy are removed, and the score increases.

The collision condition is implemented by verifying whether bullet.x is within the enemy's x-range and bullet.y is within the enemy's y-range.
When bullets or enemies are marked for removal, they are filtered out using filter().

By expanding this basic structure, you can add enemy attacks, sound effects, animations, and wave mechanics to create a more complete game!