Instant classic! With just the rock mechanic you added so much gameplay variability! And you can build so many mechanics over this, other type of items, "good" elements inside the storm, maybe a damage counter with hearts or a life bar (for the not so skilled people like me hahah).
Also you can improve it with a bit more of a visual feedback for the player, but there is a really good foundation! Great work! PS: the change to rock music never got old :D !