Do you have plans to release it for desktop (maybe using Electron)? One of my main complains about tools like Tinkercad is that they are browser-based, and it's easier/faster to have everything local. That's one of the reasons that I moved to OpenSCAD
Technically no, but in that sense everything cloud-based is local in some machine.
I wouldn't consider it "local" if I need to run a web server (!), "upload" if I want to open file or "download" to save it locally. This is client-server approach where both my machine acts as both client and server.
Do you have plans to release it for desktop (maybe using Electron)? One of my main complains about tools like Tinkercad is that they are browser-based, and it's easier/faster to have everything local. That's one of the reasons that I moved to OpenSCAD