App only displays in the 0° portrait orientation! Even Google says apps should support all orientations unless there is a very good reason not to. If only portrait must be supported, then support both 0° (portrait) and 180° (reverse portrait). Developers need to remember that there are more devices out there than just phones (some which also need 180° orientation).
Works well & easy to use. Pitty though, the background graphics reflecting the seasons of the year are fixed on northern hemisphere. As a supporter of this program & living in the southern hemisphere, to me, this program is not quite tailored for global market. It's a small to criticise, but it is an equally small thing to correct. As the world is becoming an increasingly global society, such programs offered internationally, should also reflect the same. I am often amused by such frequent oversights.