Correct! I recently patched the game to make it easier to do so.
There are two true endings, both are locked behind filling at least 3. It's a pretty chunky final chapter.
I'm sorry it was difficult for you- I have seen a couple of people now reach the end without enough to continue and hopefully in the latest version it's more straightforward. I think my way of calibrating the point scoring was too harsh in the first version.
You can use the save menu and turn on skipping for unseen text to speed through the game and make different choices. There's a skip button in the top right that should make it quite quick.
But if you don't want to do that, I can email you a save file that's standing at that final door with all the vials full. Or if you paid, I can give you a full refund!
I don't want anybody to feel let down by the game so please let me know if I can help!