I'll keep this simple and awesome, like this particular game. The pixel-based mechanics are really smooth and shuts up people spewing the myth of "omg dat lag u". On top of it is myth shattering it is a fun time sink.
Clean. Simple. Fun. These are things you want when making a game, and Falacy, say what you will, always brings the polish (no that's not people from Poland).
It plays very similar to Realm of the Mad God and that is fine and dandy- as there's a few mechanics and stylistic differences to set them apart.
Even with it being pretty well polished there's "coming soon" and "in the works" notations but progress seems a little slow- and quick peak into the forums section reveals a 3D version on unity which looks appealing.
Personally I like the current 2D hectic feel. If you're ever bored at work making money or bored in school learning, just play this instead.