I really dig this concept! Definitely have to try it with some friends. I also love how the amount of randomness keeps the game fresh without feeling unfair at all.
Some rules are left to the player to guess (like the fact that there can be cells with 10+ values), which won't be everybody's cup of tea, but felt like little surprises that kept me engaged.
That "Clockwork Game" concept surely caught my attention! Gotta give it a try myself sometime.