We've released a small quality of life update that includes a full walkthrough of the romantic routes for anyone who finds themselves stuck. This is a major story spoiler so consider yourselves warned.
You can find the PDF guide under "Additional Content" on the right in your Steam game library.

Another important improvement makes Subin's route just a bit easier to achieve.

There have been a few text changes and minor fixes that improve the overall experience.

Let us know if you're having any issues with the game.