Controls

1. Keyboard: Z, X, Enter, Escape, Arrow Keys
2. PS4: Left Stick, Start, X, Square
3. Xbox: Left Stick, Start, A, X

Note: The HTML5 version may have an odd input map depending on your browser.

2D Behavior Tree Project (2020)

Project Source Code

I made this small project so I could understand state machines and behavior trees better.

I separated control from state in this demo with the use of a generic controller node and a state machine node. With this design you can swap controllers between the squid and the enemies (editor-time), allowing you to control any character in this game.

For the enemy controllers I implemented a behavior tree system that was easy to use in Godot's scene graph. Creating custom nodes was the right move, because it made use of the editor's built-in scene graph. That was much easier to manipulate than creating a new editor from scratch.

Behavior Trees

This is an example of a behavior tree in the editor. This one is for the spitting pumpkin enemies. This uses selector nodes, sequence nodes, inverter nodes and what I called "function" nodes. These leaf nodes are configured in the details panel and execute code that lives on the enemy controller.

State Machine & Controller

Each character implements their own state machine and transitions, as well as their own controllers. You can swap the controller out for a player controller, which will allow you to play the game as another type of character.

Here's a demo of a playable pumpkin enemy. Simply changing the enemy's controller to a player controller allows you to do everything the enemy is capable of!