If you do not leave a level once you start it or commit to a route that does not get you all the crops, you will not have to worry about using a life. If you set up path that ends badly, tap back to reset the route. Be careful; if connect the path to the rabbit hole, the rabbit you are controlling will automatically begin walking down the path. Do not commit to a path until you have planned it out to get all the crops. There is no time limit, so plan carefully.