You’re not wrong.
The extension currently lacks anti aliasing. This will be worked on in the future, most likely after we’ve switch to a different rendering technique (using regular meshes, like Spine).
As for the gradients, we’re in the process of implementing it. A first step is implementing uniform array,s which will arrive in the next release.
As for the animation issue, I’d be really happy if I could get an example file to test with.
In Rive’s source code, there are a two other previewer’s I’d like to compare with in order to figure it out.