But we don't test all the games. We lack the resources, and it really isn't part of our mission. Steam could... yet they allow games with no executable in the package at all. We'd at least contact the creator if something like that was reported here.
And are you sure those are repeated failures? If other people can run the same games you can't, then maybe it's your machine. Happens all the time, on any operating system. There's too much diversity out there to guarantee that every game works everywhere. Even in the 8-bit era, when in theory each home computer had one fixed hardware configuration, that wasn't quite true, and such things simply happened.