You can make any feature in your game but you also need to build every aspect of the game.
Viewing post in game engines
That’s not true. Most engines, big ones like Unity and Unreal included, use plenty of middleware.
I don’t have to build a physics engine, graphics engine or sound engine for it to count as my own project. As a software engineer, you simply have to pick the right tools for the job.
In contrast, by being made for every use case, Unity and Unreal are never the right tools for any job.