Well the idea behind the images was pine trees as viewed from above. Perhaps that would have been more clear with green but our research showed that black orange and blue are colors that are pretty universal for various forms of color blind people to see. We figured making the trees blue like the water would make sense from a game mechanic aspect.
Ah indeed now that you say it i see the pine trees. No problem for the color, it is the jam's limit, and still understandable. I don't know if i'm the only one, but to me the black crosses between the pine tree were more visible than the trees themselves. I don't know how to avoid this... Give more Space between trees ? A more randomized position for each tree ? This is just a minor thing anyway, good job for the overall game !