Helm, that looks incredible, but shouldn't you try to use more shades of color? I mean, you have the option and 2D-games generally don't look like that anymore.
This is a restriction-based skillbuilder, for me. I spent as much time making the art as I did trying to make it fit in 40 tiles. Therefore, I place conservation on all fronts very high in my to-do list for this image. Adam wants to see conservation, without the image suffering, I show him conservation without the image suffering. 'Many colours == more interesting image to look at' is an illusion. I've trained for years on how to unify palettes that have very disparately tinted slots, and this is what I do here too. Every end of the colour spectrum is represented, reds, greens, blues, yellows, purples and browns.
Plus, given that I have only 40 tiles, adding more colour to some of them would create many problems of cohesion and reusability of the tiles, no?