Thank you! We decided to go with limited dark palette due to lack of skill in pixel art, but we figured out after while that 1bit is even harder than the colors.
As we get the feedback on color palette quite often, it is something we are currently considering to change.
I'm a pro pixel artist and I want to help. I will do it for free and can also advertise your game on my you tube. You have a good game on your hands and deserve to succeed.