Hi! I just saw the screenshot and recognized that you used the Debian logo as a starting point for your own. The modification seems to be just the text over it, so it is still pretty obviously the Debian project logo. While I looked it up, this so called "Open Use Logo" version is released under both the GPL 3 (or later) or CC BY-SA 3.0. This means you are indeed free to use, modify and redistribute this logo without restrictions, even commercially, but I decided to write you anyway, because you might not be aware of the Debian project and wish not to affiliate yourself with it. I for example got curious what Debian had to do with a Covid app.
That's it from me, stay safe and have fun programming!