Thank you for not taking it the wrong way. :-)
This open world would be nice if I were playing a FPS, looking over my shoulder for enemy soldiers, or something like that. Given as you aimed to implement VR, I understand the temptation to make the game environment explorable. As it is, there are multiple ways of limiting the play area without letting go of immersion. The sea and the cliffs make effective borders, but enemy soldiers on patrol or watch dogs...a mine field, perhaps, would all make it perfectly logical for the player not to venture further in any given direction. (But one shouldn't really expect all that from a jam game made in just a few days.) Keep up the good work.