You can turn it off in the options.
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However, it might be fun to show something visual to show your current "strength". Currently, your overalls change from brown, to red, to white. I think both brown and white look bad though, so I'll probably just leave it as red and not draw any attention to that :)
Yeah, I agree that using 2D dice on the menu, driving 3D dice in the world was a little confusing - I've got a potential solution for that in the post jam update. Same goes for the rolls themselves, we definitely didn't make it clear enough. Perks are only ever rolled on doubles (and they're temporary), so there's a good chance you didn't get one!