Doomsday Survival: My Shelter Can Be Upgraded

Planets exploded, the solar system mutated, and the entire earth was rained down by meteorites, falling into an apocalyptic crisis! But in the apocalypse when everyone was struggling, Lin Yi, who had awakened the system, got a shelter. The most important thing is that his shelter can be infinitely upgraded! "Fifty points can be exchanged for shock-proof steel" "Three hundred points, exchange for biogenerator" "One thousand points can be exchanged for a super three-dimensional training room" ... "Well, if you earn another five hundred thousand points, you can upgrade to a dungeon. This time, should I use the Iron Man armor or the Cybertronian Fire Source?"