I think the fact that Sven was always running out of mana in the playthroughs shows that it is not currently well balanced. It could have been the result of a low level character using a high level spell, but we don't know that yet. Mana per spell can be complex depending on levels and power so this might end up not being a major issue. I well remember spamming pots (I made myself) in the original, but I'd prefer that not to a necessity in a TB game.
