Pretty sure you can add neutral colors to a single colored palette. And by pretty sure, I'm certain. Not to mention that this is an off-white with a tint that goes. There's nothing wrong with the neutrals. The reds don't seem to be of the same hue, however, which is a problem. Maintain a single hue with different variations in lightness/opacity or go for an analogous color scheme (although that would change a lot). Overall I don't have any big problems with the layout. It's fairly clean and straightforward and the font hierarchy is mostly fine with the exception of the OSBot logo itself which I don't personally like the typeface for. I don't think anyone is going to be blown away by it, but it isn't anywhere close to repulsive.