feedback on pvz3 difficulty

I was playing pvz3 and I noticed that some levels have very unusual difficulty, from levels 1 to 430 with a lot of zombie spam 
o level 145 is hell to pass we need to spam zombies on all levels so that it stays balanced so that players can pass the levels without using the boosters too much
I hope when Pick You Tean comes the game's difficulty isn't like that and This also happens due to a lack of mechanics that the game could have.

and about the smart lawn mower I have an idea of ​​how it could be improved currently it can only be used once and then it disappears
I think we can have four uses of it to help get rid of many groups of zombies and This mo players because they have to use boosters, some can't even put together a good amount of restraint because they have to spend it in matches and some spend a lot of coins buying boosters that normally they have to be joining.