I've just finished the Prologue and I gotta say, I really like the premise. Main gameplay of most adult RPGs resides in the choice "Is my MC a slut or a fighter".
Your idea of Dryads alleviates it, because both fighting and fucking is reliant on each other. Instead of mindlessly fucking every other monstergirl, I have to decide if I want to use pheromones to seduce and get stronger for the next encounter, or should I fight and get more pheromones. And while I'm not into pregnancy, I can see how it's not a big deal for MC. In other games getting pregnant feels like I've fucked up.
What I'm trying to say is, great game design, man.