Zombie Outbreak is a game that I made using LWJGL (a low-level OpenGL wrapper for Java) when I was 16. This was my most significant project at the time,  and all programming was done myself.

Here is a link to the game’s thread on Java-gaming.org, where I posted during the project’s development. Here is a download link for the game, which is runnable on Windows.

Feel free to check out the project on GitHub.