I'm a game developer that has made her own game engine. The engine is a strong driving force behind my project and is the primary focus as it is the backbone of my games and I am professionally a software developer.
That said, I am invested in making fun games and have a world in my head I would like to show people. Additionally, I need the perspective of others to better gauge my work (you can only grow so much alone). For these reasons I have aspired to release games at least bi-annually so I can get feedback and improve overall.