hey hey! glad you're trying out processing. you only included a PC exe file but i downloaded it and easily copied and pasted it into processing on mac and made a data folder with your duck and hamburger png's and got it to run. See attached screenshot.

Will be nice to see you go into Processing more. You could pick up Getting Started With Processing or Learning Processing.
OR
skip this and learn P5JS which is processing for the web p5js.org so that your games can live online and playable in the browser. There's Getting Started With P5JS book on O'Reilly Media.
Your sketch could be ported pretty easily. There's a P5Play library online you could use for working with animations and collisions in games.