Thanks for the feedback! The UI was actually my biggest worry with this game, as I teaching myself how to use Godot's control and vScroll nodes while working on it. I was actually planning on doing what you said about the hotkeys for each dice, but I couldn't get that to work in the time I had. Still, I'm glad to see that you enjoyed it!
Also, fun fact: when you click the fire button while it's on cooldown, it doesn't actually deselect the current die due to a bug lol
The dice icon changes from the selected color to the normal color whenever you click any other button, even if the button is disabled. However, actually deselecting the die only happens when the button's function goes off, so not when a disabled button is pressed. I just find it really funny how I overlooked that.