Robo Hockey League
I made a multiplayer hockey game that is a blend between Rocket League and a First Person shooter as my final project in a game development course. I had to use my school's game engine, which was very incomplete. Thus I had to hack it in order to add the features I needed including view model rendering, HUD rendering, transparency, and animation support.
I'm quite pleased with how it turned out.
Download RoboHockeyLeague
Origins
In 2016 created a mod within Goldeneye: Source that added a giant deadly hockey puck and it was a lot of fun.
Download Goldeneye: Source's hockey mod's server files
After a bunch of iterations on it I wanted to see if I could make it it's own standalone game.