The First Hero - Early Demo

Trying out an RPG mixed with era progression like Civilization. Im interested in each level introduces a new enemy unit, but phasing out older ones in place for upgraded ones. i.e. a rock thrower, becomes a slinger, becomes a simple bowman. At the same time, each level, you add an upgrade to your abilities. Currently upgrades are quite generic, and nothing is balanced Would love to see what people think of it!