Fun while it lasts, but cant unlock drill

Ive played six games so far and every time Ive gotten stuck where there are no open pathways (every way is blocked by rock wall or boulder), but the drill is still locked. Been down below 1100 feet, collected up to sapphires and red emeralds, none of these missions even if completed would unlock the drill.

J.S. Bleccch about Treasure Miner - 2d gem mine