I made my game entirely in java so that's just knowing how to code. what's more. the fact that he made his own game engine kinda bit him in the ass, the game would almost not run and the screen wasn't sized properly on my computer.
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on my computer it would run at less than 15 fps at all times. Considering that this is an extremely simple 2d , black and white, tiny map type of game, there is no reason why it should be running so slow. For example, i can run the game I developed that has a much larger map and 50+ ai's moving around the map at at least 30 fps . Given that i'm on a trip and on my laptop, this might be why it ran slowly, but regardless, the game is optimized veryvery poorly.
Well it kinda runs in the console and it won't run a lot faster without either major optimisations or by using stuff like opengl or some graphics rendering library. (which your game probably uses) Also the fps is capped at 20 FPS and for most people that have either played or playtested it, it wasn't a problem.