I try to cover a wide spread from simple to complex, from easy to hard, from fighting to puzzle, but usually I have to have at least one technical challenge in it for me to program.
As a coder I recognize some of the technical features. For example the fine scroll with side split screen in Metal Mayhem. Not to mention the impressive 3D engines of Ancients and Minotrace!
Yesterday I expanded my little colony. I had to dig really deep to get some carbon, but my little fellas died instantly. The ventilators must be located in the same level as the mine? I understood they just fed all the complex with air equally.