I've played for all of ten minutes, so take this with a grain of salt: It's a side-scrolling browser based MMO built around silliness and co-operation. No combat; it's intended to be relaxing. The operative adjective is definitely 'cute.' There are skill trees, but they apply to constructive skills.

I wanted to dabble in it because a bunch of friends I see rarely in meatspace have been playing it, I'm interested in game variety (even if it doesn't grab me in the end) and because E says that when I play ME3 MP right before bed I charge all night in my sleep. :P