This is actually pretty awesome! Out of curiosity, I imported an entire folder of images, and it worked perfectly. A few image combinations really made me think it would be cool if this app had a collage mode: where it would fit several images together to cover each page. Since this app is half-meant for manga, a right-to-left reading mode (that starts from the last page) would also fit nicely.
Otherwise, this was a really nice surprise, so I'm glad I checked it out. Great work!