This is a very interesting game, sort of making a "Factorio Tower Defence" of sorts, except it works (very nicely) on mobile. (This is hands down, my favourite game on mobile now.)

From the present version I have, I haven't progressed far (I take my time, but still enjoying) and exploring the research trees, different maps, biomes, hexes, etc. from campaign mode. Again, this is a very interesting game and I quite enjoy it.