Global Catastrophe: Open with 1000 Acres of Survival Base

Disasters strike, strange beasts appear, and humans eat porridge to survive.
Su Yuan was lucky enough to activate the survival base system, harvesting millions of kilograms of grain every day, exchanging one piece of grain for ten pieces of resources, and frantically upgraded the survival base.
Ding, upgrade the survival base to level 1 and get a disaster early warning aircraft, so the equipment can be upgraded once for free!
Warning, a wave of alien beasts will break out in 4 days, please prepare in advance!
Warning, meteorite rain will come in 18 days, please prepare in advance!
Warning, the super cold wave will come in 26 days, please do not leave the survival base...
Ding, the survival base has been upgraded to level 2, and you will get...