A larger queue of shown pieces
Right now, there are three pieces that are shown and can be selected for use. A suggestion I have is to expand the number of shown pieces, but not allowing them to be selected.
For example, if 3 extra "slots" are added, there would be a total of 6 slots. The first three can be selected, but the last three cannot and are just there to show what's coming up next. It would be nice to be able to plan out what your next, next move is according to the pieces that can come up, so I think it would make for a more fun experience.