From the game page:
"You are a gorilla who in ancient times escaped from a human zoo. Consequentially, aliens abducted you as a fascinating intelligent specimen who had risen above the expected intelligence of an average ape and subsequently placed into an alien zoo.
"Today is the day. You cannot take it any longer; you must escape the alien zoo and find your way back home.
"Use your banana beam to fight off the alien zookeepers and win your freedom back!"