OMG this was amazing.
A few points for improvement. Having to click the die to reroll it, is very impractical bordering on impossible at the later speeds. The score for the 1 is way to high in comparison to how easy it is to do and how useful it is in clearing the play space. There also seems to be a bug: if the one is covered on top, bottom and either left or right, then the falling die on the other side triggers the one, even though the falling die position is not next to the one. Also, it is a very small game space to be working with, especially in the height.