It looks very nice but now the jam is over, please use these 12 extra colors :D It is far easier for visual discrimination.
These is 1 thing that annoy me (maybe it is just me), as you can only move/swap if you manage to create a reaction, it is not user friendly to have to press B to unlock the selected gem and releasing the cursor. I would prefer to visually see the swap, then swapping back because nothing occurs and releasing the cursor.
But this is just a small detail, this is a really great job in such a few time.