This game is very cool! i love the endless possibilities with the plant maker and some challenge with the zombie wave maker. i have some suggestions to improve you're game!:
*Addition for shooter plants to shoot in 2 other lanes and shoot in 5 directions.
*Addition of the Melee Class witch attacks within a range (depending on sun price).
*Addition of a Zombie Maker with Armour types and stuff. Custom Zombies can only be accessed in your own Zombie Waves.
*More Customization options.
I really hope you add these!