I really enjoyed your game! The concept is super interesting, and after a few minutes, I was able to figure out how everything works and what I needed to do. It was a lot of fun exploring and figuring things out!
The game state is clear, and you get all the necessary information, but I think it would be great to have some UX/UI features, like showing which tool is currently selected and highlighting the square the player is hovering over.
One thing that felt a bit frustrating was when a plant would disappear immediately if over-watered. It might help to give the player a little time and options to save the plants when they make a mistake, rather than having them rot away instantly.
Overall, this could become a really cool game if you plan to develop it further! :)