I've tried plenty of pomodoro-esque apps and this one is the standout. Planting trees actually keeps me interested in focusing longer without distracting me from my work. I bought the premium upgrade months ago and haven't looked back. My one suggestion would be to work in break times. Typical pomodoro is work 25 mins, break for 5, work again, etc. Maybe have a popup asking if I want a 5 min break every 25 mins, a popup that can easily be ignored if I want to continue working instead.