Brawliseum is a 2D dungeon crawler with procedurally generated levels. Download the brawliseum.jar file for the playable version of the game (make sure you have the JVM installed).
If you would like to run the game from it's source, download the zip then unpack and import the project into an IDE, such as eclipse, using gradle following the instructions in this link: https://github.com/libgdx/libgdx/wiki/Gradle-and-Eclipse