Oh, that's my very much unfinished wasm version from 2013. It wasn't meant to be a "vandalized" or dumbed down version; I just stopped working on it because Simon released a much more complete wasm version on his own site around the same time.

I've recently started working on an updated PWA port that works offline and on touch devices, mainly because the iOS app hasn't been updated in years. (If you hunt around you can probably locate the work in progress, but it's not ready for critics yet. I'll post a link when it is.)