Fast Leveling in Stonewards
Since the original demo was taken offline specifically because the game had evolved past it, don't rely on older demo footage or impressions to judge the current build -- go in expecting the more polished Early Access version described in recent developer updates.
Since returning late from the mines is confirmed to leave your teammates fighting shorthanded, prioritize efficient routes through the procedurally generated tunnels over exhaustively exploring every hidden cave on your first few runs.
See the full data: Stonewards Getting Started