Well...
I understand that you clearly said "yes, we clearly inspired to Plants Vs Zombies: it's a so epic game!". But where's the innovation? Where's the creativity? The game is, indeed, fun to play, but I only see this as a PvZ tribute, not a new game.
Are you proud of using a well built formula to achieve success or should you be trying to create something new, something revolutionary? Take the chances and use your creativity, that's what games are supposed to be...