Better icon

Right now Focus is using the new task icon, which is confusing and not really suitable. Instead, it should use something else. :P A clock without the "+" sign might work, or you could go with something more branded/unique to your app (while still following the icon guidelines).

http://elementaryos.org/docs/human-interface-guidelines/icons

If you're not a designer, you could post a request for help to the Google+ community; there seems to be a lot of action there.