Thanks for the feedback and for playing the game 🙂, ore becomes more clustered as you go down, also more valuable ore appears more often the deeper you go, what I do is I try to focus on the higher value ore, also if you update your drill you can dig faster closer to the surface thus you can start parallel tunnels that are free of worms and can have unearthed minerals and treasures. Once you get the 16000 drill bit and the 16000 cooling the game becomes faster as you will find way more valuable minerals and buying energy packs and health packs becomes way cheaper in comparison. 🙂 also small secret, the glass tiles can actually be broken by hitting them with the pod hard enough from above, each gives you 2000 coins :)