Obviously, I need to set "I apologize for your frustration" as an auto-reply.)
The game is as much about crafting as it is about exploration. However, it is a very early version and some game mechanics are still missing. Hopefully after the integration they will close the current gaps in the game.
Miners mostly allow you to mine and explore at the same time. The ROI is already there for some resources, in the added value when crafting the resource into more valuable chemicals/items. You usually want to construct it on top of a "glowing" resource.
One thing to rush for is the repair nanobots - to keep you alive long enough to defeat bosses. Current game content culminates when you incarnate and defeat your own personal boss. I will be adding more content soon!
Thank you so much for playing the game and posting the feedback!