▁the ▁film ▁" a ▁wonder fully ▁nast y , ▁gru esome , ▁j ag ged - edge ▁gem ▁of ▁a ▁horror ▁film " ▁that ▁has ▁" first - rate " ▁cinemat ography , ▁set ▁design , ▁sound track , ▁and ▁editing . ▁Barry ▁H ert z ▁of ▁The ▁Glo be ▁and ▁Mail ▁awarded ▁it ▁a ▁full ▁four ▁stars ▁and ▁wrote , ▁" J er emy ▁Sa ul nier ▁( M ur der ▁Party , ▁Blue ▁Ru in ) ▁continues ▁one ▁of ▁the ▁best ▁stre aks ▁in ▁independent ▁horror ▁with ▁this ▁ter r ifying ▁and ▁invent ive ▁thr iller ." ▁Len ika ▁Cruz ▁of ▁The ▁Atlantic ▁said ▁it ' s ▁" a ▁t ense ▁g ore - fest , ▁one ▁that ’ s ▁as ▁gr im y ▁and ▁cla ust roph ob ic ▁as ▁the ▁tit ular ▁room . ▁But ▁scra pe ▁off ▁the ▁sc um , ▁and ▁you ’ ll ▁find ▁Green ▁Room ▁full ▁of ▁visual ▁art istry , ▁dark ▁humor , ▁smart ▁writing , ▁and ▁gl ints ▁of ▁human ity ". ▁Jon ▁Nic c um ▁of ▁The ▁Kansas ▁City ▁Star ▁said ▁it ▁" ble eds ▁authentic ity ▁— ▁from ▁the ▁sc rag gy ▁look ▁of ▁the ▁perform ers ▁to ▁the ▁har sh ▁sounds ▁of ▁their ▁environment ▁to ▁the ▁distinct ive ▁squ al or ▁that ▁becomes ▁the ▁day - to - day ▁life ▁of ▁those ▁travel ing ▁together ▁in ▁a ▁cr amp ed ▁van ". ▁I GN ▁awarded ▁it ▁a ▁score ▁of ▁ 9 ▁out ▁of ▁ 1 0 , ▁saying , ▁"