As thekaleb mentioned the creator seems to reference this symbol a lot in his games. Here is more of a back story (after some google-fu of course as I'm not very familiar with the games)
Seems like Keen 5 has it as an easter egg to reference Wolfenstein [1].
And Wolfenstein uses it since the game has a "Nazi Party" within it (if you fight them or fight with them I'm not aware of) [2].
Interesting quote from [2] "The inclusion of the swastika led to the banning of the conventional game in Germany, as cultural stigma against the swastika is high there."
For reference the plot of Wolfenstein is that you are a captured soldier trying to escape from a Nazi controlled castle. You are fighting against the Nazis.
True but regardless of which one is technically correct, both pretty much share the same negative connotations now. I used to always hear people talking about how the swastika is really a sign of peace, but regardless of what it originally meant, it doesn't mean that anymore.
It doesn't have anything to do with Nazis to at least a billion people in India. I'd even bet that the majority of people around the world associate swastikas with non-Nazi stuff.
Seems like Keen 5 has it as an easter egg to reference Wolfenstein [1].
And Wolfenstein uses it since the game has a "Nazi Party" within it (if you fight them or fight with them I'm not aware of) [2].
Interesting quote from [2] "The inclusion of the swastika led to the banning of the conventional game in Germany, as cultural stigma against the swastika is high there."
[1] http://www.shikadi.net/keenwiki/Keen_5_Easter_eggs#Swastika
[2] http://wolfenstein.wikia.com/wiki/Swastika