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Not Gamescom-related, but there was a Nintendo Direct that showed off some indie/partner games on the 27th, and a CoD thing today (the 28th), if either of those were what you were thinking of?
Only other thing that comes to mind is maybe the Future Games Show, but that was last week (list of trailers here).
Did a quick search, looks like ExeKiller, which isn’t out yet. Hope you find something good to play in the meantime!
True, but I think maybe you missed this being about additive and subtractive color mixing.