1. Good move to protect yourself as a developer and making the app easily available outside the App Store. 2. Consider supporting older macOS versions. 3. Have a look at https://workrave.org/ and https://www.dejal.com/timeout/ for additional feature consideration (competition research). (Tip: Workrave is better, even if TimeOut looks nicer - focus more on that).

Very cool idea. This would also be kind of cool to have a timer that would remind you to look at something in the distance every 5 to 10 minutes to keep your focus range exercise while using computer.

Is this based on any existing research? I would think your body already blinks enough as needed to keep your eyes from drying out.

I don't see a LICENSE file. Do you intend to choose a license?

https://choosealicense.com/

Really neat -- going to poke around with this!

macos sonoma is a very high requirement...

Good idea.