Every time I play this game thinking "This time I'll get the Badge" I get to Level 12 or so then rage-quit when a guard stands next to me for 15 seconds and my invisibility runs out :(
Little tip: Never give up!!! I came back from having half my base destroyed and only 3 blasters which retreated survived. In the early stages it's about holding off the Creeper while building up Reactors.