I feel like you achieved the atmosphere you were going for, so nice job with that! It could definitely work as a backing track in a game, although the only thing maybe getting in the way of that for me is that it feels like the piano and other meliodic parts play at quite loud and "forceful" dynamics (especially middle and end of the piece). A softer approach might blend in more in the background of the hypothetical game, but could just be my own preference!