Is there any way to restore my project (the url was https://glitch.com/edit/#!/poop-bot)
You can un-delete projects from your Glitch profile page. They’re listed at the bottom of the page. Click on your avatar from the Glitch.com homepage and select Your Profile.
Actually, it turns out one of my friend who helped on the project previously (and was removed from it) had been given access to it, whilst mine was denied. He added me to the project and then I was owner of it again.