The concept is fun, though I noticed a few things I took note of. When playing for a while, at a point the game would start lagging because of the number of enemies in the room. It was also a little hard to tell the difference between your plants and resource plants. I did read you Dev Note, and this game does have potential! A nice fantasy spin on the "Plant vs Zombies" concept.
EDIT: I played the Browser Version, it may handle better for the download version.