Originally Posted by Ubisububi
A small rock can, indeed, kill you if you hit it with your shield down. I'm pretty sure you already knew that; just clarifying for other readers.
That's not what I experienced unless the dev changed the game. The only things that can kill you are giant boulders, missile/comets and walls. The small rocks only drain your shield.
I guess i'll just reinstall the game to confirm, but I'm pretty sure that's how things are.
Edit: yup, just confirmed it. You can hit a small rock right after hitting a boulder (confirming you have zero shields) and not die.