I loved your game ! Especially the chill atmosphere and the gameplay. It was so relaxing ;)
The only things i would say is that maybe it's a bit too long for the difficulty to increase. I had then to speedrun a lot of levels when i was maxed out to increase the difficulty ...
Also, i found a game breaking bug : when you die from an enemy, you can actually resurrect with a potion and move while the death window is active. So if you discovered the treasure, you cannot lose unless you fall into a trap.
I used this technique a lot to defeat monsters when i discovered the treasure but no potions left.
Overall it's a good work !