Cave Digger 2: Dig Harder

Take your pickaxe and head to New Frontier!
Cave Digger 2 Dig Harder is an action-adventure game set in wildland valleys where you explore old mines, nautical caves and ruins of ancient civilizations inspired by western, dieselpunk and Lovecraftian themes.
Venture down a mineshaft and, against the clock, dig for treasure. Your treasure is then sold and you can upgraded your equipment to allow you to dig deeper and buy new tools to mine for different materials
Cave Digger 2 Dig Deeper features 1-4 player crossplay, new combat and a campaign mode

Source: TheGamesDB