Looking at your demo, you definitely have a launch-worthy v1. Do it now!
I think you're sufficiently differentiated from Blippy and Swipely, and even if you aren't - so what? How many people outside of HN and the Valley know of these two startups? There's a ton of users to acquire and engage and you are by no means behind in the game.
I really liked your gallery implementation - did you build it from scratch?