Nice! It would be cool to have more dice-oriented features incorporated, but I like the polish of this. I found a bit of an exploit in the fact that multiple buttons (Space, Enter, Numpad Enter, and Left Click) all result in an additional roll, so you can go obscenely fast by spamming all four with both hands haha. Not sure how one would go about preventing this exploit, maybe forcing the user to choose only one input method?