If you think about it, everything that doesn't make sense in the game is literally "because of the traveller". There isn't any story to explain anything else let alone what the traveller is.
Examples
Why does the moon have normal gravity?
How was Venus able to be terraformed from 800 degrees Celsius and crushing gravity?
Why do we have 4 known enemies fighting us for no apparent reason?
How did we die and come to life yet alone be in russia?
So what other miracles has the traveller done that you know?
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Well, It took the traveller 15 minutes to save me 15 percent or more on life insurance. Even gave me a little floating buddy called a "Ghost". Boy, saves my hide every time. Almost like I'm ACTUALLY dying...how neat.