Yes! Having friends and collaborators look at what you’ve put together can be really helpful and reassuring. Just click “Preview” at the top of your project preview while you're creating your project and send the link to anyone you'd like.
The link isn't password protected, so it's very easy to share with friends. If they have a Kickstarter account, friends will be able to leave feedback right on your project preview. Once your project has launched, your preview link will redirect to your live campaign page.
If you shared your preview link and don't want people to see it or leave feedback on it anymore, you can always click “Disable preview link” at the top of your project preview.