Thanks for the report, I'll take a look at it! The insta-kill is a future mechanic what isn't fully implemented and wasn't supposed to trigger yet. I'll fix that.
That's the Overkill mechanic, isn't it? I saw it in the switches for the game. So that's not supposed to activate yet, because it's unfinished? Thanks for saying so, I'll disable it. Rather not break the game by mistake, y'know? :)