This is super cute and I would love using it for writing sprints/other projects, but I tried keeping it open while I played another game, and I ended up having to close both of them because the minimized witch with her cauldron stayed on top of the other game's window and kept me from interacting with significant portions of the other program. I also checked to see if it would interfere with a browser. It will shrink if I use my mouse's scroll button, which makes reading easier if I wanted to look at a news article or something, but the same amount of the browser is still unreachable because it takes me back into the Pomodoro program.
It's easy to work around when I'm on my desktop and I have a large monitor/an extra monitor to work from, but I wouldn't be able to use it on my laptop, which is a shame.
I hope you stick with this because I think it's a great concept and I love the artwork!