Really neat game, and cool take on the theme! I like that there's 2 endings; the easy to get one that's a bit sad, and the other one which is happier, though it took a few minutes to get to that ending lol. I think there may also be a bug in the second ending where the audio doesn't stop properly, so restarting the game causes 2 audio sources to be playing at the same time?
My only nitpick is that I think the gameplay is a bit too simple for me; not trying to say that these kinds of simple and straightforward games can't work, but having some more actions that I could take other than walking would feel more interesting, just my two cents. You could explore more parts of the mind and this person's relationship that way. Otherwise, really great job on the submission!