The original is not a roguelike, although it has some elements in common. You go into a procedurally-generated series of caves in a team of 1-4, shoot a bunch of bugs, mine a bunch of rocks, and complete the mission and return to base after ~30 minutes. You can use what you got in the mission to buy permanent upgrades for the four classes. The only penalty to dying and failing the mission is that you don’t get much of a reward from that specific mission