I love the vibe of this game -- this is exactly the kind of thing I'd like to keep in a small window next to my work so I can watch the plants grow into cool patterns (I'm with JoyStickJamboree on that one). The color scheme and theme of expanding a garden/farm is a great choice for an idle game.
I'll note I too mistook the instruction icons to mean the scroll wheel was involved like Linku did, FYI.