Each month the graph starts fresh making it hard to see changes across months. Same for years. It would be better if there were no artificial breaks between data.
It's hard to see longer term trends because the bars are too wide. It would be great if I could use the pinch gesture to change the width of the bars.
The app seems to ignore screen rotation. If I could rotate from portrait to landscape then there would be a lot more space to see the graph through time.
I have some minor complaints,