Suggestions;)
I am playing this game for a couple of months now, and so far, there are several suggestions that I have in mind that may potentially improve the game (or not lmao)
**Note: I am not that fluent in English, so please bear with me.
1.) Freedom to decorate your lawn. I personally think that the players should have full control over their lawn. Players should be able to place all decorations along with the house and garden wherever they want across the lawn. They should not be limited to some pre-determined spots or places.
2.) Chat/Messaging Feature. Players should be given the opportunity to socialize with each other in the game. This can be done through private messages between friends, chat in communities, or a global chat.
3.) Redundant Abilities. I believe that there should be more abilities for plants. The same abilities of different plants can sometimes overlap in high tier plants. I suggest having two categories of abilities, the general and unique. General are the pre-existing abilities that are versatile, while unique ones are those abilities that can only be obtained from one plant (idk maybe all plants have unique abilities or only tier 1, since they are the foundation). In addition, maybe replace the current abilities unlocked at level 8 with unique ones.
4.) Puff-shroom should be tier 1. Sun-shroom is the equivalent of Sunflower during night, so I believe it is only correct to make Puff-shroom an equivalent of Peashooter. Not only would this fix my OCD issues, but it may also bring more ideas for tier 2 and 3 plants to add if Puff-shroom is tier 1. An example would be Scaredy-shroom, Fume-shroom, Hypno-shroom, and all the other shrooms.
5.) Pure night levels. Shrooms should be given a level to shine. Introduce a whole new levels where it is completely dark on all tiles, instead of giving us several pre-determined tiles where we can plant shrooms without them dying overtime.
6.) I DESPISE PIGEON ZOMBIE!!!. Why on earth is this old man zombie as strong as the muscular zombie that throws imps? And the cherry on top is it spawns a whole abomination of pigeons in FRONT of it. It can't be even countered with Spikeweed that you recommended as it only gets eaten by pigeons leaving no crumbs behind. I believe that you should revert it to its mechanic way back on its first launch, where Pigeon zombie along with Chicken Zombie spawn their ahhwholes around them.
These are all the suggestions I have so far, I don't know if this is helpful or not lol, I just want to express the ideas that I have in mind to potentially help with the improvement of the game. Overall, I am having fun with the game. For now, I will rate it an 8/10 (-2 bcs pigeons ate it).