Looks nice! (Although I do wish the simulated pixels were of the same size as in an actual DOS or SNES game.) There is a lot of walking involved, which is to be expected in a game about collecting plants in a forest -- but I still wish there was more interactivity: e.g. the ability to examine objects and get some response from the player (the dog, the house, the other plants not used in the quests).
There is also not much of a difficulty progression: the final quest is supposed to be challenging (based on the dialogue), but it's as straightforward as the three before it. Maybe the plant could be obscured behind another one, or, instead of the picture, the book would only contain a textual description of what it looks like, etc.
Also, I was repeatedly trying to collect bogberries instead of blueberries and was getting frustrated that the game was not responding to my attempts to do so. Maybe some text explaining that that's not the right thing would be nice -- or even better, if I could collect them and bring them to the herbalist, who would point out that I brought the wrong thing.
Nice job overall!