Blue is you. Red is rude. Space is real estate.
1Drag from your blue planet to any planet to send EVERYONE — attack reds, adopt greys, or drop onto your own planet to pile up a fortress.
2Drag through several of your planets to chain-select them — one flick, full army.
3Your planets grow over time. Grey ones don't — they just float there until someone adopts them. Take the whole galaxy to win.