Pixelmator Photo is such a nice edeting App. But it is possible that there is a mask tool with a brush to lighten up eyes or something like that. Just a example. I thing to have a brush as a mask tool and maybe also vignettes would make the app perfect and completely replaceable with lightroom on desktop or mobile devices.
A fan of Pixelmator
Discuss Pixelmator Photo and photo editing on iPad.
I will 2nd this as a feature request. Masking is the one thing I regularly use. Other than that, I just discovered Pixelmator Photo and it hits the sweet spot of what I need in an editor.