App is absolutely amazing, I love it. The only problem I have with it is that you get a popup asking you to upgrade way too fast. Zoom out too much: popup. Zoom in too much: popup. Just put "this is a premium function" on the top of the screen or something please. I would love to buy premium but this monthly / yearly subscription is too much for me.
Also, an idea for a feature: I live in a place with a moderate amount of light pollution. It would be nice to have a slider to only show the brightest stars. That would make locating objects in the sky a lot easier.
Still though, very great app!