Any suggestions outside of my own personal preferences, which I believe to be meaningless in group thought such as this, would be tied to color theory in relation to psychology, particularly in the mood in which color evokes. The greens that were previously chosen invoked a cold or even ill effect at worst and a lack of fun at best. However, much of this has now been mitigated with your use of gradients to add a very pleasant and warmer blue that fully compliments the green that you have already firmly established with your brand so far.
Also, In doing this, you have subconsciously tied the user interface into the more pleasing color scheme associated with the OSMC website. Anything to further that goal is a step in the right direction in my opinion. Perhaps even adding more from that scheme in minor highlighted areas would further add to the appeal and tie your branding even closer. Maybe add a highlight or two of the warmer colors from the OSMC fractal imagery.
At the end of the day, options will always reign supreme in group projects like this. The ability to use multiple color schemes as well as background images would likely please more people if not everyone in general. As I realize that this would take considerably more work and time, I feel that I must again compliment what major improvements you guys have accomplished with this new look and feel so far. I would have no hesitation in using this skin for my own personal install as is.