I have made a couple of applications with Flutter. Mainly for Android and iOS. I really think Flutter is great. It's my favourite framework currently. It feels like a modern Android SDK and frankly how the Android SDK should feel like. My "biggest" project currently is an alternative to the official NissanConnect EV app for controlling Nissan electric vehicles. You can find it here if you're interested; https://play.google.com/store/apps/details?id=dk.kjeldsen.ca...
It's also open source; https://gitlab.com/tobiaswkjeldsen/carwingsflutter
EditTexts feel different, but as a user I don't see much difference..
Great job! and props to you for making it open source