yup! the instructions are listed when you download the game, but here they are for convenience:
"This game is an executable .JAR file. In order to run it, you must have Java installed on your computer - be sure it's the latest version! (You can get it here: https://www.java.com/en/download/) From there, it should be as simple as double clicking on the program; if that doesn't work, please look up how to run a .JAR executable on your operating system. Check the README for controls and credits!"