Based on the hamster simulator (https://www.java-hamster-modell.de/simulator.html), a Robbi Simulator is created here in the course of the module "Fortgeschrittene Java-Technologien".
Dear Mr. Java, you could try implementing a speech bubble instead of implementing an alert, when Robbi can't move. In that way it looks more interactive and fun.
In Order to make it unnecessary to download the properties file as well, the program should look for a properties file on startup and if it fails to find one, generate one on its own.
Loading the assets takes some time by now. As a preloader is already partly implemented by 983ebe9 a full preloader also loading the assets should not be too hard to do.
See this documentation for further information.
The logger variable from lombok cant be used in the code as the variable in the custom Robbi is not created. Running the application in the development environment does not run into these issues. Only when using the compiled and packed version the logger does not work.