Controls
Left-drag: box-select units
Left-click: select one unit/building
Right-click ground: move (auto-engages enemies)
Right-click enemy: focus attack
Right-click crystal: send worker to harvest
Ctrl+1/2/3: assign control group
1/2/3: recall group (tap twice to center camera)
Minimap click: jump camera
Mouse to screen edge / arrows: pan camera