Does Cloudflare use any user agent?

If yes, whats its name?

Also, does the CSS,JS etc minifying actually work? the html nor css doesnt seem minified in my browser.

PS CF is great!

Cloudflare just forwards the User Agent used by the visitor. Sometimes it will crawl the site for its Always Online feature:

Mozilla/5.0 (compatible; CloudFlare-AlwaysOnline/1.0; +https://www.cloudflare.com/always-online) AppleWebKit/534.34

As for minifying, yes it works if it can parse your code: