Quote: "Guessing the recent Meltdown and Spectre chip bugs will have rendered a few min specs obsolete too."
Not by as much as you'd think going by benchmark scores. Keep in mind most games require mostly a decent GPU and 8GB of RAM, along with a decent but not great CPU. One of my older PCs has a GTX960 and 8GB or RAM together with a really old Intel i7 CPU and guess what, the CPU isn't the bottleneck even with it being close to like 7 years old now.
Also, technically speaking just copying minimum specs for AppGameKit 2 wouldn't quite be the same as minimal specs for whatever game you've made. It depends on whether it uses the 3D engine or only 2D, shaders, has big worlds and so on. I do think this particular 2D game should run on basically anything though.