Your experience sounds similar to mine. I used to write games from scratch in C/C++ and I would quit the projects after I wrote most of the engine code (which w

Your experience sounds similar to mine. I used to write games from scratch in C/C++ and I would quit the projects after I wrote most of the engine code (which would take a few months), and had something presentable. Back then there weren't engines like Unity and Unreal that solve most of the technical problems like rendering, and physics/collision detection. Even with these tools though, I still find it difficult to finish a project quickly because I spend so much time writing infrastructure code. For that reason I never do hackathons.