What about your graphic card drivers? Are they up to date?
I will try to tweak the shader a little in the next version to see if it helps, since it seems to be working on at least a couple colors it might be that the color selection is a bit too strict for some computers.
I have added the compatibility option to my backlog, I'm not sure if it'll be ready for the next version and I will most probably have to make some features unavailable when using this option, but it should at least make the game playable.