▁the ▁other ▁using ▁the ▁attachment . ▁ ▁Up ▁to ▁four ▁players ▁control ▁spaces hips ▁as ▁they ▁travel ▁through ▁" a ▁tw isting , ▁turning ▁te ch no - pl asma ▁canal ▁in ▁space ," ▁the ▁goal ▁being ▁to ▁collect ▁enough ▁energy ▁" to ▁pen et rate ▁an ▁al ien ▁portal ▁and ▁war p ▁to ▁the ▁next ▁condu it ." ▁Not ▁collect ing ▁enough ▁energy , ▁which ▁fills ▁a ▁meter ▁at ▁the ▁top ▁of ▁the ▁screen , ▁will ▁result ▁in ▁the ▁player ' s ▁ship ▁being ▁destroyed ▁at ▁the ▁end ▁of ▁a ▁level . ▁If ▁the ▁player ▁completely ▁fills ▁the ▁energy ▁meter , ▁however , ▁then ▁at ▁the ▁end ▁of ▁the ▁level ▁the ▁player ▁will ▁be ▁transport ed ▁to ▁a ▁bonus ▁level ▁where ▁no ▁enemies ▁are ▁present ▁and ▁the ▁only ▁objective ▁is ▁to ▁collect ▁as ▁much ▁energy ▁as ▁possible . ▁Play ers ▁can ▁also ▁collect ▁points ▁in ▁the ▁game ▁to ▁try ▁to ▁beat ▁the ▁high ▁score ▁by ▁destroy ing ▁enemies ▁and ▁collect ing ▁energy . ▁Point s ▁multiply ▁and ▁accum ulate ▁when ▁the ▁player ▁avoid s ▁enemy ▁fire ▁in ▁addition ▁to ▁shooting ▁down ▁enemy ▁space craft . ▁ ▁A ▁variety ▁of ▁weapons ▁and ▁power - ups ▁can ▁be ▁found ▁throughout ▁the ▁game . ▁Def ensive ▁power - ups ▁have ▁a ▁wide ▁range ▁of ▁effects , ▁such ▁as ▁providing ▁temporary ▁inv inci b ility ▁or ▁slow ing ▁down ▁enemies . ▁Player ▁ships ▁also ▁come ▁equ ipped ▁with ▁a ▁gra pp le ▁gun , ▁which ▁allows ▁the ▁player ▁to ▁pick ▁up ▁distant ▁power - ups ▁more