Thanks for building, cryogenicplanet!
Just wanted to add I really like the "no-upload" programming paradigm a lot. I use browser native webgl rendering internally for example to automate generation of static digital art assets. All samples and finished images are transferred via http. And its easy to run on any device: just fire up chrome and enter url.
I'd like to do the same for the video asset generation pipeline as well. For which I do most ffmpeg processing on host. WASM build allows for browser based video generation on the fly ;)