Very well done game. I made it up to the coconut level. then I believe it became very difficult. But the concept is great, the art is cute. Everything looked very balanced and I liked the description for each plant. It was really enjoyable to play, many levels, new enemies, new plant.. Very refreshing gameplay. The only issues I had was at some point it wasn't let me place energy plants, like I reached a cap or something and when I had my shooting plant selected before I even decide where to place the "ghost" version of my plant was shooting enemies and enemies were attacking to it and could kill it. And as far as I know I didn't get charged for the cost because i didn't plant it yet.
Overall it was a great experience playing the game. Excellent works. Congrats!