Very good game, loved the concept I think it's very creative and has a lot of potential if developed further, that said, if you work on it more I would recommend you try to mitigate the frustration from the randomness, maybe an algorithm that makes sure the king doesn't pick the worst tiles too many times in a row or give the player some way of limiting the king's actions some times, so that they feel more in control and that strategizing has a reward.
Maybe also maintaining the rewards of the tiles if the conditions were met later, as in placing water next sand could still "activate" the taxes from the sand tile.
Overall a very fun game, I tried and tried until I beat it, nice job!