I bought it on PS4 and have finished every path and am working on new game plus. I loved the game but did experience a bug where New Game + did not display. I assume it was because I played the endings out of order.
I played August - Madeline - Liam - Julian. I got the good ending and a check mark on all endings. I Uninstalled and reinstalled the game. None of those things unlocked New Game+. I replayed Liams path again after finishing Julian's and NG+ unlocked correctly.