Progress is great, missing parts are: some pathfinding for the invading Hero, some stats on him, a win/loose condition, sounds and if I got time for it: A proper intro scene.
Here’s the annotated screenshot and I got a first build for ya to download: https://www.dropbox.com/sh/jnmvjpqtu6m01eu/SasCaG41gA?m (windows, mac, and löve2d)