I regularly notice that the Proton VPN icon is gray, meaning it is no longer connected, even though I was connected just a minute ago. Also sad that it is missing the Kill Switch, pretty important feature for a lot of users.

Nice idea, unfortunately it disconnects continuously from VPN.
UPDATE: the disconnections were fixed in the 0.1.7 release.

Would be nice to see what protocol is being used.

Works well and is simple to use.

It's a beta version but seems to work very well. Good job