I think you need to adjust pricing to differentiate between big corporate users and small developers. I'd pay $199 once (not per year) for my own use. But if I were running an IT shop at a larger corp, I'd pay a lot more. See if there is a way to expand your pricing both at the high and the low end.
Like all simple apps, I expect I'd run into roadblocks quickly without some customizability. The trick for you is to figure out how to add some of that without losing your main value prop, which is simplicity.
In particular, I'm sure I would want to customize screens. I didn't download the app and try it so I don't know if that's there, but I didn't see it in the video.
Also, consider supporting Postgres. MySQL and SQL Server usage are trending down, and Postgres is trending up.
https://trends.google.com/trends/explore?date=today%205-y&ge...