Climb and test the cold
If freezing ends the run before you reach better crystals, warmth is the likely first upgrade.
Start with the simple loop: climb as high as you can, mine crystals, sell them for cash, then upgrade the bottleneck that ended your run.
The safest early path is to learn when cold, mining time, or bag capacity is slowing your progress.
If freezing ends the run before you reach better crystals, warmth is the likely first upgrade.
If rocks take too long to break, pickaxe upgrades should improve cash speed.
If you keep returning to sell before freezing or mining speed matter, backpack capacity is the bottleneck.