Hello. I just did a casual 100% playthrough the game and tried to use 0 Elixirs, so in order to do that I avoided all chests containing Elixirs, but it seems I need to collect them all anyways, so I collected them right before the final boss and saved + reset if an Elixir needed to be used.

The question is, I didn't use any Elixir, but at the end of the game it still said I used 1 Elixir, that's because there's 2 chests with Elixirs. So 1 Elixir is stored, and the other is used to recover to full health since you can't store 2?

Any help if it's possible to complete the game 100% with 0 Elixirs?

Hi there! You're definitely correct that you have to open all chests to obtain 100%. As a result, my understanding is that you must use 1 elixir to obtain 100%. This would be an interesting question for the devs, who I've found to be pretty responsive on Twitter.