Your are stuck underground, but you found a gem generator !
Occupy the largest space you can with those gems for maximum score.

To move use "wasd", arrows, joypad hat or change it in the parameter.
To put a gem push "Space", to change gem push "c".

There is a heigh limit for the base of the gems. Score is based on the surface occupied from a top view. Only the cliff hangers will succeed !

(I'm a solo dev, Gem Shader from Unity, Ground Material from John's Junkyard Assets)