Read more about it: http://www.rockpapershotgun.com/2014/12/03/the-bestest-best-tactics-of-2014-door-kickers/

Door Kickers is a smashing top-down tactical masterclass, with enough missions to shake a nightstick at, randomised enemy placements to add further variety, and a bundled level editor allows devious designers to create their own maps and missions…Door Kickers is a complete package of planning, panicking and policing.