App seems really good, I really like the new features you are putting in to add the custom email notifications. This will be a great way to not only keep in touch with our customers but also interact with them as well.
Heres an interesting article I found relating to this subject =)
http://www.shopify.com/blog/18058812-get-more-sales-with-these-5-email-receipt-marketing-tactics
kind regards,
Devon
ps: we have made those changes to our theme now.