There are many plants vs zombies clones around and this is one that runs over the web, this chrome application just links to a website and runs a html5 game. The major downside to this game is it has optimization issues.
The game first of off really isn't too detailed granted a lot of high res hand drawn graphics but the issue lies in the amount of ram required. It runs at about 5fps on my chromebook acer 11, granted I have a early model of that.
The game also is basically just a attempt of a exact clone of the game plants vs zombies, but it falls short on so many ways with microtransaction incentives mixed in there in this "Free To Play" game found of playzool's website, they also are the ones to have uploaded this game to the web chrome store.
The gameplay is simply just too slow and they even added a x2 button to increase the play time just to "fix" this issue but it really needs a few more multiplyers because again that is even too slow.
For a free to play clone of pvz it is ok, it just needs improvements here and there on the polish as well as the gameplay. Also loading times are long waits.
You can download the game here: Battle For Kingdom Downloads