Nearly perfect color scheme for smithing bellows

[EulersIdentity.8096]

So the new blacksmithing bellows "Simon" game (press one of 5 buttons) is nearly perfect. In EoD and SotO, it was way too easy to distinguish between the one i'm supposed to press and the other 4. And it usually only took <5 button presses. However, in JW, you get it 90% of the way to being a complete guessing game (to my eyes). I can sometimes almost distinguish them. Is there anyway you can just make all the icons identical so i have a 1 in 5^n chance? By my math that is something like a 1 in 9,765,625 chance to complete it for 10 button presses, which seems like a much more challenging game. I'm sure there is 100% love for this minigame, so you can even make it more challenging by increasing the button presses to at least 100...

Thanks!