I'm still a few months away, and I could totally do that. I already implemented backstab damage a long time ago but only 2 enemies use it so far. Also, pushback sort of, since if a unit is walking back then the pushback actually helps them. The greatest hurdle is tutorializing, really.
I should really add a taste of late game mechanics to the demo so it works better as a vertical slice. The game is becoming too easy ever since I made items more relevant and I'm thinking of adding even more so a bit of rebalancing to early game encounters is probably in order some time in the future. I'll keep your advice in mind when that time comes.