They say a horrible thing was done in this dungeon.
This might be one of the reasons, all walls are covered by roots.
And the inside is still stuffy.
Something must be hidden in there.

VR Glasses

You can play the game with VR Glasses such as GearVR and Cardboard.

Tap the glasses mark on the bottom right to switch to the VR mode.
Turn toward the direction where you want to go.
Focus on the spot for a short interval to make an action.

Desktop

You can play the game with desktop environment

Drag the screen to turn toward the direction where you want to go.
Focus on the spot for a short interval to make an action.