What a fantastic submission! I'm jealous of the juice you have here :)
You did a great job with the atmosphere in particular: all of the portraits & other art were great, the sound design was really snappy, and the UX feels very smooth & complete.
Some of the other comments left some good feedback (e.g. selecting who to send, difficulty over time, character leveling), but to add a little more I wish there was a sound when a new card appears and maybe a little number on each tab to show you the number of cards you have not seen yet. I found myself constantly tabbing between the two to check for updates on either page.