Hi Ben ...
I had perused your site before but did take another look just now. Personally ... I do not have much a problem with your site. Yes the colours are dark ... but the fonts are large and if needs be I can use the browser to make the fonts larger if I have to without a problem.
Were you keeping the visually impaired in mind when you designed the site? If it wasn't planned ... it was a terrific stumble
If I had any suggestion that might improve one wee part of your site ... it would be with regards to your Username & Password boxes. I "tested" it sort of ... and could not read what I had typed in. Maybe a slightly lighter background and different font style for the box might be something to consider ... if you are so inclined
About 5 or 6 years ago there seemed to be a universal effort being made by the web design community to keep web pages "visually impaired friendly". Unfortunately ... I think that effort has fallen by the wayside.
Take care ... Happy Holidays
Peter