I did the same thing 10 years ago. I probably spent about 9 months full time building a game on a custom OpenGL engine, but at that point I realized how many sy

I did the same thing 10 years ago. I probably spent about 9 months full time building a game on a custom OpenGL engine, but at that point I realized how many systems I was still missing (for example animation, more advanced effects and shaders, etc). But as of recently I'm now doing game development again, but this time using Unity. I've learned that game development is really hard, geometrically more so than a random business application or tool, and you have to use all/any tools that are available to you.