I didn't constantly test the project for the web; [ctrl]+[w] was indeed one issue arise half way while on development. I've added some alternate keys, so you can gain/lose altitude with mouse wheel or [q] and [e] keys. These info were in the onscreen menu activated by pressing [esc]...
well... it was another mistake: the [esc] key also mess with the web version.
Anyway, finally I managed to realize the stand alone downloads were hidden. I assumed the downloads were there, but that's something I'll have to add to my quite long list of mistakes.
Now the download for Windows, Linux and MacOS are available.