Charming little platformer you got here!
At first I thought I was stuck, because the jump height was set too low... but it seems like you thought about that situation and generously gave the player 3 water to start! That helped me learn the mechanic and that felt great. Nicely done!
The win/lose messages are funny. Never have I seen a game say "groovy" at the end, and ... I love it hahaha
I think there's lots you could do to expand on this for sure! Aside from having more levels requiring the user plan more carefully, maybe there could be enemies that eat plants when they encounter them! Or keys and doors, pushable plants, etc. Stuff like that could turn this from a jam game into a full game! :D