I don't see a lot of 3D games made using GMS2 so this was nice to see! Here's some feedback from my 10-15 minutes of playing:
First of all I'm not a big fan of the camera movements, feels a bit too "wobbly" and nauseating for me.
I like the exploration and gathering materials aspect of the game, but the tiny inventory size hampers that experience quite a lot. Would be nice if I could explore and forage for a while without constantly having to go back and forth to the brewing station.
As for the brewing aspect of the game, I like the idea of being able to name your recipes! However in practice after the 5th potion or so I just don't know what to name them anymore, especially because we don't get to know the effect of the potion until we apply it. Also, when I tried brewing a similar potion with the exact same combination it asked me to name the potion again, I'm not sure if that's intended.
On a positive note, the 3D models and the environment of this game looks quite good! The concept of the game is also interesting, I think it can be a fun game after some finetuning.
Oh btw I had to download the game because the HTML5 embed didn't fit properly into the window. Next time I'd recommend using GMS2's .zip export instead of the .exe installer export, it's a lot simpler for smaller jam games like these so people don't have to go through a whole installation process just to play your game.
Congrats on finishing the gamejam!