There are tests, but I don't collect any real usage statistics to double check them... I could believe that if you pick up the dice and carefully throw it lightly, you can control the values more than intended, and this value would be somewhat correlated with the previous roll for quick enough rolls.

I did think about changing the rotation speed of the dice before you throw, kind of speed it up and slow down. I first added the shuffling effect if you hold them; kind of a shell game animation. If I improve it more, occasionally giving some dice a swift spin would make it harder to defeat I think.

Like you say, this is intended for people who are not going to cheat each other and just want to have fun, so I won't make it worse to account for it.

I guess it works better on mobile with a swipe. I could change space to hold it a brief moment and throw it harder. Now that I am looking at it, that is probably what you mean.

I think I want it to use physics in the end though, not map an RNG result at the end. You can see the faces and what you get is like a real die. If someone can beat it, maybe that is good for them.