Definitely agree on getting rid of the countdown feature. It's definitely bad as a first user experience; almost certain the first picture anyone takes will be bad and they may not see the "Slide down to retake" text.

Also, I like to be able to send text with the picture too, just to give a bit of context. I really imagine using this as a reverse Snapchat that let's me get pictures instead of sending them. Being able to give context to the picture is great. On a related note. I like being able to see comments on a picture when scrolling through the feed. Making the comment viewing section a separate screen in the app makes it less useful.

Also as a comparison to Snapchat. How long do the pictures stay around. Forever?