Getting out of any trap is a huge challenge but getting out of an alien forest is nearly impossible. Yes, just nearly impossible but not impossible. The astronaut while traveling in space unfortunately lost connection with fellow astronauts and entered an unwelcome territory. His curiosity to find out about that area must have brought him there but now he is in all sorts of trouble. He has to escape from that place before the aliens come back and find him. His intelligence cannot be doubted though and we assume that he will surely be able to save himself. The only that we can hope is that he does not overlook any clue or objects that can actually be helpful.