EDIT: Fixed now, as told in the replies.

I only see:

> Space is unavailable offline.

> Only spaces that you're a member of, and have visited recently, are available offline

and I can play and add card and move them. What am I supposed to see?

Ya there seemed to be some server downtime preventing you from loading the space, and because the app works offline you got that message

Whelp, that was bad timing... try it again... but yeah, if you have an account you can drop a comment anywhere.