Thank you for playing the game and for your nice feedback, Pontus!
The game is a bit unclear, but all you needed to do was to unveil the symbols on the cup so that the corresponding part of the letter would be translated.
It's great that you felt like you were in someone's home and that you found the solutions made sense within the space, it's something we aimed for for sure!
Thank you for playing through the game and the feedback!
For the letter, if you press the L key while in the game you can look at the letter whenever you want to. It should update after you complete a puzzle that reveals the related symbols within the letter.
We will try to improve the door opening and the ending in the future. Unfortunately the ending had to be a bit rushed, so it's some very valid feedback.
Thank you for trying the game out and your feedback!
You did the right thing with putting the guksi (Sámi wooden cup) in the sink, it shouldn't matter if you do it before or after filling the sink with water, as the purpose was just to clean off the dust off to reveal the symbols on the handle.