Thank you for your comment, we will check your game out for sure. As for the Instability score we thought a lot wether to share it or not and decided there was fun in experimenting by yourself. Basically it's Instability value = Tech weight (some are worth more than others) + (Era depth score * number of sons) + 1 * 0.05 * number of turns. The deepest eras weight more (from 4 to 1) and when you clear all techs from an era that value goes down by one. We tried to push players to take risks and still keep it interesting. Glad you enjoyed it