Indie maker of https://t.co/jOpxbnSEd4. Product. Code. Business. Minimalism. Roadtrips. Music. Photography. Personal growth.
I'll, however, give more thought to this use case since it's important to "minimize the lows" ;D
Hope the app helps!!
Having said this, and knowing this is a widespread need, I am already thinking of ways to support "partial goals" (maybe with colourcoding as you suggest) as well as the possibility to track "frequent tasks" such as "gym 2x week".
I know you might find the differences subtle, but they do mean a lot in terms of UI, communication and also in the actual goal of the app.
Thanks again for taking the time to write me valuable feedback and I hope the app will help you :)