As I previously explained to you:
When you buy the game on Itch.io, you’re purchasing the version that is available at the time of your purchase.
New chapters are released as separate builds, and each one needs to be purchased individually.
Even if the game shows up in your library, that does not include future updates or new chapters by default.
Additionally, older versions are priced at 3 €, while the latest release (with the newest chapter) is always 4 €.
This reflects the ongoing development and helps support continued work on the game.
If you’re unhappy with this model, no hard feelings – you’re welcome to request a refund.
– MCK