This was made using the Processing framework: https://processing.org - Simply download the Processing editor to open the .pde files.
You can download the compiled game from here:
https://drive.google.com/file/d/1oELTF31e7bA5scU0eOLIQwVCirCwg6OZ/view?usp=sharing
Sources for the sounds and music can be found in sources.txt.