We are extremely sorry to note that some users have experienced an unforeseen critical bug after updating their copy of Alone With You to v1.02 on PS4 and Vita.
NOTE: this patch was pulled immediately after deployment. If you can choose not to install this patch on a game in progress, please do not do so.
Long story short: there's a problem with the checkpoint system. It can cause the player to get sent to the wrong room upon loading the game that was saved before the patch. Currently we do not believe there is a way to recover your progress, but we are investigating.
UPDATE! - 10/3/2016
v1.03 of Alone With You (PS4) and v1.02 (Vita) is available for North America. (Europe should be in a day or two). We can't be 100% sure if you will lose progress because of the bug incurred in the last patch, but feel free to submit a help ticket at firstname.lastname@example.org if you experience any further issues.
Versions affected: v1.02, PS4 (NA and EU); v1.01, Vita (NA only)