Love the art and alien plants! The title screen, color and music are cohesive and create a nice mood. I think I was able to figure out how to play just by clicking around, so it was fairly intuitive, but not positive if I was missing something or parts weren't finished. It wasn't clear what the plants did once they were fully grown...
Couple other minor things: credits look unfinished, music looping isn't working on web build (we had the same problem in our game, it can be fixed by connecting finished signal to a function that restarts the player)