The game started to feel repetitive towards the end - same environment, same mechanics, same enemies, same music. I think the game didn't really need to be that long. Also, at first it wasn't obvious I was supposed to go somewhere - the initial location looked like a closed off game map and I almost quit the game after fiddling with the plant mechanics. Others have mentioned already how awkward it felt to move towards the camera.
On the bright side, I really liked unique and complex, yet intuitive mechanics. The visuals were great too!