Thank you so much for playing and providing feedback.
>cause you have healing potions, but no mana potions(or maybe they appear later).
You might have missed the terminals, but they sell Magic water items that restore mana. They can only be gotten there.
But I made the game hard on purpose so the player would explore more to try to find new ways to get stronger. I understand that you wouldn't like it. I made it to fit a niche and mostly that niche only.