I've found some errors (in the version that was uploaded here, at least) in Machines apart from the lack of music.
The interior of some (I haven't verified all of them) buildings is the one of the Red Race, even if that building belongs to another race.
Also, I've noticed that the Blue Race uses, sometimes, the Green Race's logo/badge. The Green Race's pod has the exact same badge that appears in the Red Race's campaign as well. This last two details could be justified considering the storyline.
In addition, some of the textures look a bit odd. For example, the Green Race uses a camouflage pattern that isn't very aesthetic. So we could implement something like this:
Or the olive green used by the USA in WWII and Vietnam, etc.
Some of the badges/decals look strange as well.
I'll see what I can do.
One more thing: is it possible to add another race for including white or gray (the creators intended to add the last one but didn't, for some reason)?