Nice, does one thing but does it well. The only thing that puts me off a bit is the grey background, as I associate the pomodoro brand with red - I like the way the pomodoro icon changes color to reflect the state though, so I can see why you went with a neutral color
Yea I went with grey because its neutral color, but I am thinking about implementing dynamic background color based on the current state which would make the app more colorful and it would be easier to recognize whether you are in work or break interval.