Please, please, add an auto-save option of at least the two single photo's. This will speed-up the workflow and it will prevent accidental loss of a taken photo.
People are not used to manually save a taken photo.
I forgot it myself a couple of times too!
Also, manual adjusting the balance between the two shots, with or without adding a customized mask could improve the final result.
The logo of this app let you think that there are lots of options to make, but unfortunately almost everything is auto-only.
Color temperature is almost a must!
I really love the idea of this app, but it needs improvement to get better results.