▁as ▁Pri est ▁ ▁J ake ▁Wilson ▁as ▁D anny ▁ ▁W un mi ▁Mos aku ▁as ▁Marie ▁ ▁Harry ▁Sau nd ers ▁as ▁El sa ▁ ▁Amy ▁Sh iels ▁as ▁Jo anne ▁ ▁Production ▁ ▁W riter / direct or ▁C iar an ▁F oy ▁based ▁the ▁film ▁on ▁his ▁own ▁experiences , ▁including ▁an ▁attack ▁by ▁youth s ▁in ▁h ood ies , ▁who ▁threatened ▁him ▁with ▁a ▁dirty ▁s yr inge . ▁ ▁The ▁youth s ▁did ▁not ▁ste al ▁anything ▁from ▁him , ▁leaving ▁him ▁confused ▁as ▁to ▁their ▁motiv ation . ▁ ▁F oy ▁was ▁left ▁ag or aph ob ic ▁by ▁the ▁experience , ▁using ▁the ▁film ▁as ▁a ▁method ▁of ▁c ath ars is . ▁ ▁F oy ▁was ▁influenced ▁by ▁Stanley ▁Kub rick , ▁David ▁C ron enberg , ▁Ad rian ▁Ly ne , ▁and ▁Chris ▁C unning ham . ▁ ▁Production ▁took ▁five ▁years ▁to ▁get ▁off ▁the ▁ground . ▁Sho oting ▁took ▁place ▁in ▁Glasgow , ▁Scotland . ▁ ▁Re ception ▁ ▁Cit adel ▁received ▁mixed ▁reviews . ▁Rotten ▁Tomatoes ▁gives ▁the ▁film ▁a ▁score ▁of ▁ 5 5 % ▁based ▁on ▁ 4 0 ▁reviews , ▁with ▁an ▁average ▁rating ▁of ▁ 5 . 7 / 1 0 . ▁On ▁Met ac rit ic ▁it ▁has ▁a ▁ 6 2 / 1 0 0 , ▁based ▁on ▁ 1 3 ▁reviews , ▁indicating ▁" gener ally ▁favor able ▁reviews ". ▁ ▁In ▁a ▁mixed ▁review , ▁Je ann ette ▁C ats oul