This was done really well. You even have the instructions lay out on the screen.
This is my gameplay feedback:
It took awhile to know what to put down and then the click to activate the sequence because the game loads with the monsters to the side, it didn't seemed like they would attacked and I assumed we were just growing things but after placing things down, nothing happened.
Also the map load in a big open space so the initial first instinct is to walk around and explore, which also meant I didn't think about planting the stuff or what it will do even though you had all the instructions laid out. After figuring out how this works, I cleared the little monsters that I grew and man I wish there was more.
The visuals are great, the font as well, would love to see you take this to another level of a game.