This is very impressive, and very polished! I feel like I would play this regularly if I had it on a Nokia phone.
It does give me retro Nintendo vibes (in a very good way). Honestly there's not much I can think to say about this because it's all so good. It feels like a complete game, not something made for a jam. Good job!
The one thing I would say, is that if it were actually a phone game, I'd make the plants take longer to grow to encourage more incremental play. But for the jam the speed worked great, so that's not really a valid critique, lol.
Nicely done, I enjoyed it!