What a cute little exploring game! The art and the world design in general is really beatiful!
I couldn't find the last plant so I don't know if you have something more after finishing the game, so i can judge only at the exploring stage of the game. Maybe you could add a health factor that focuses on keep eating the plants. Also, it might be interesting if some plants give you a special feature like speed, or eating automatically the next plant, or more time? (if there was a time management).
Overall, the game is really pretty and you should keep working on it. It has potential!