Loved it! I laughed from the very first conversation with the mention of doomscrolling and knew I was gonna have fun. :)
It's a very cool take on the theme and, although the term 'alchemy' might invite us to do so, you chose not to go about it in a pretentious way, which is so cool. Your alchemy is simply natural medicine. It's tea. A kind of witchcraft in and of itself that we've explained away in a banal way nowadays and consider to be nothing special. And yet, if we choose to look at it that way, it can become nothing short of brewing a magic potion or a healing salve.
The shadows simply being negative thoughts whisked away by surgical application of the pertinent plant is also very sweet.
I really liked the gameplay loop and think this could be a lovely puzzle game if you were to keep working on it. You could expand on your three basic teas to create more complicated puzzles and even take inspiration from games like Desperados or Shadow Tactics for level design.
Anyway, that's just a few thoughts. Again, I really liked the game - thank you very much!