User blog comment:QuebecanCanada/System-making game/@comment-25913433-20141125084207/@comment-6812733-20141125181024

That glitch happened to me too, on a planet that wasn't supposed to be able to host multicellar life. I evolved it but then it turned back into simple-single celled life... Or it could've been hit by a GRB which kills almost all life on the planet (killed my mammals!).

Also the habitable zone should be around 1.3 AU to 1.5 AU I think (my habitable planets near G0 stars are 1.3 and 1.35 AU away from the star).