All it takes is hours and hours of grinding and purchasing upgrades. After a few profitable gold runs I find myself with a small fortune to spend on a few choice upgrades. Once I'm ready I purchase a few powerups to get me rolling and from there it's all about increasing damage. I make my pickaxe bounce off enemies several times and have a very high critical hit chance. From there it's just increasing everything as I find it, and I find a lot. Even the bosses seem like a joke after all this. They die very fast and I take little damage. UnderMine gameplay with my commentary as always!