The visibility of the small diamond bullets was a major issue since their inception, and it was seemingly coming down to color. It was either well contrasted against the gray part of the background, the white part, or the bananas, but it was surprisingly difficult to make them contrast against everything! We actually went through 6-7 different colors before ending up with the pink gradient. I reckon there's a perfect color for them out there somewhere, and maybe a differently colored border would help too.
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