Processing App (Download if not on a Chromebook)
OpenProcessing website (Use if on a Chromebook)
Source Code, Sprites, Resources
Here are the links to the Base Game and Sprites folder.
Base Game
OpenProcessing Version of Base Game
Sprites
Sprites as a Zip file
Processing documentation
Processing.js documentation
Piskel
Gimp
Catch Game Tutorial
Tetris Tutorial
Tower Defense Tutorial