Three player multiplayer, farm treasure, build treasure mining machines and shoot waves of enemies that attack you. Then upgrade between rounds and get ready before the next wave starts. The game feel is first-rate, with fast, dangerous enemies. I really like the boss demon enemy that can smash you across the room. I love the multiple classes that have very different playstyles and upgrade paths between mining rounds so replay is high. The animated intro drew my attention and the music is good. The personality of the game developer comes through with funny "junk" items being farmed sometimes :-). Again, gameplay is first-rate. Love the fast, classic, boomer-shooter style of gameplay.