I enjoy this game, the music is very swell! A few things that may help you: when you reach the end of the supply of your stem then the screen starts jerking around. I think whats happening is your reset value is X while your movement value is X+n. Thats just what I think.
Also movement would be a bit smoother if you mapped the flower to direct towards the mouse and move towards the direction the mouse is facing when MouseLeft is clicked and fire the seed when MouseRight is click? It would play more smoothly I think