Yeah its a neat setup. The in browser emulator + preview is interesting. 2D (and 3D) live previews and pure browser emulation are things I’m considering as well.
The simplification of tools for Arduino/fastLED is also pretty nice, though I don’t like that it relies on a cloud service and the compile + upload times are still about the same as if you were using an Arduino IDE locally. Previews are a little faster, which is cool.
Overall its a nice app wrapper around fastLED for sure.
For discussion about fastLED api compatibility and porting, see this thread: