This mod is all about game development, and was my first mod 
It has a good couple days of content assuming casual play, and it’s all fairly well balanced despite the lack of linearity. The last bit of the game has a bit of a grind though. unfortunately.
Also, unlike other mods and even the original TPT, in this mod layers only reset along branches. This leads to resets being much more strategic!
Check out the source code for this game at GitHub - thepaperpilot/The-Modding-Tree at gamedevtree