Sand Simulation Godot Edition

This is just a little project I made in Godot. 

Controls:

right click: draw

left click: erase

number 1: switch to bedrock

number 2: switch to sand

number 3: switch to water

number 4: switch to lava

r: restart

esc: quit

middle mouse wheel up: zoom camera in

middle mouse wheel down: zoom camera out

ctr + middle mouse wheel up: decrease brush size

ctr + middle mouse wheel down: increase brush size