An interesting concept, though I struggled to make good decisions in the game. I think the balance is a bit off, especially considering that a "5" is considered trivial but the average roll for two d6s is "7". I.e. if all the success chances were dropped by about 4, the game might play a bit better.
I'd also have liked to see some more mechanics around adjusting dice rolls, or at least improved effects if you get numbers far above the target. Maybe dice as a resource, so you need to weigh up rolling more dice for a better chance or fewer dice to conserve resources (which would fit nicely with the narrative of the game).