Got this in the game industry hardship bundle and this is by far my favorite! Controls well, game play is fun and the missions going between timed and 'take as long as you want' keeps it engaging, while also not too stressful. Also way more upgrades/tools than I expected and its making me excited to do another playthrough where I experiment with the different ways to mine. Well worth the price imo!
Have you considered a sequel? The foundation is already here, so a few new resources and a new campaign is something I'd happily purchase.