The game is very cool, and the Rig mechanic helps provide player with a little bit more control over the game, reducing the reign of RNG. It was a really nice touch, especially satisfying when paired with different dice mechanics. However, I think the balancing (when it comes to stats and dice power) needs some work - Orphan's Revenge is really really meh, giving it a restricted roll range of 1-3 (or 4 or 5 with upgraded versions) really makes it weak. When you are out of Rigs, it becomes very risky to use it. You should make it so that rolling into 4 5 6 should do something at least, just like the Earth's Wil; (if you don't get 4+, you would still at least get the original 3 block).
Other than that, the game is really nice! Perhaps some art and UI addition would spice up the game as well!