Really unique idea! I was surprised to discover the physics element with the large and small stones and had a lot of fun with that. On my second attempt I tried to make some defensive walls by stacking the large rocks. It actually worked to a degree until I accidentally hit one of the walls with a small rock and it toppled over destroying almost all my flowers :D
The control method of clicking your destination then aiming took a little bit to get used to but made a lot of sense. I think this could work great as a mobile/tablet game!
Very cozy time playing it with the music and cute art selection. Nice work!