Do you live in a world where every blemish, random bird, stray pedestrian, and telephone wire is perfectly round? Me neither!
Therefore I think you’ll really like Snapseed’s new ability to heal arbitrary-shaped regions. Just tap the filter selector, tap Healing, and then paint away the bits you’d like to omit. And of course these operations are, like everything else in the new Snapseed, non-destructive, meaning that you can go back and re-edit them and/or copy/paste them among images.
Here’s an animation of healing in action: