I like the PvZ gameplay style, i also love Fungi and UI design, i know it's first release it might not be that perfect, but here's some suggest:
Enemies spawn rate is kinda slow compared to PvZ
Fungi cooldown is slow while i gained too much Spore
One stage is long, it's take me around ~5 minutes to finish it
You can try PvZ and PvZ2 and adapt to it
Good Game <3