The game is very relaxing and fun. I love the idea, and the execution was spot-on. The art style was great and the sound cues were very useful. The music fit nicely. The keyboard controls were needed to deal with infected plants quickly, especially with how hard the early game is xD
Gameplay wise, I feel that if each different task had a different look on the plant, or maybe just a small timer above each plant, the player would be able to go between plants more efficiently and lose less plants early on. Maybe also a different mode with a time limit, to see how many plants you can keep alive and how much score you can get in 10 minutes.
In the end, The game seemed very polished and bug-free (unlike my plants), I enjoyed it very much, and wish you good luck in the game jam :D