I played around with some color blindness simulating filters, and Idlepunk still looks amazing in straight up black and white, protoanomoly red/green, and tritanomoly blue/yellow modes of vision. (At least, so far as my software based filters can emulate them.)
Deuteranomoly, the most common form of red/green colorblindness, is a little rough. The specific green and red most frequently used in the game are almost identical.
I don't know if that's even a priority, but wanted you to know. I'd include screenshots, but (annoyingly) my screen capture ignores the filter.