I can’t speak from experience as I don’t own any Amazon devices, but I have read reports that it seems to work fine with the FireTV variant of Android.
The dev has only tested it against Chromecast with Google TV, with that said I’m using it on a Shield TV and a Shield Pro and it runs fine on both.
I grew one during lockdown, decided I liked it and kept it. I suspect I am not an anomaly in this.