Hey @sam_nazarko and everyone at Team OSMC, great job on the skin design! In the past I have always replaced the OSMC skin as it was just not what I am looking for. However with this new design I can see myself using it. The only thing holding me back is the colours again.
As a frequent user of my OSMC setup in a dark space I find that the colours are just to bright in those situations, so I typically lean to darker skins. Maybe, a theme setting for just grayscale would be a good idea and most likely fairly easy to implement as you do not have to search for additional colour pallets that work well and the shades should translate nicely over.
Just some quick thoughts from my end as a web/graphics guy!