Hey there,
That's a great looking app! Functionality is definitely there and really beneficial, the only thing I would suggest is that the trial is a little short to see how it could affect sales and benefit the store. You might want to consider expanding it to at least a week to give people a bit of time. If they have a slow traffic period it's going to be hard to see how well it influences sales.
I'll def throw it into my store and have a look at it though :)
Thanks for the hard work!