Great Game and Awesome art, it is very easy to get addicted to this game (in a good way) and that makes it a good game and makes the Developer a really smart guy.
Sometimes I wished that there were competitions on this game just to see it getting pushed to its limits by professional players.
Also here is a random dice idea: "void die", creates a an empty space X places away, can only have 0, 1 or 2 as faces, grow, terrain and boost don't affect it, and it gets improved by "silver" and "gold" tiers like the mirror die.
I think this would make for a fun die to play with, tough it might be a bit broken. and could fundamentally break the mirror die