Not that good, actually...
Concept:
stick men - we've all seen it billion times. It's easy just to draw few stick characters - it's original at first, but after 10 games it gets really boring and distasteful.
Gameplay:
has a huge lag problem (not really a lag, but it gets very slow if there is "lots" of action), ruins the action spirit of the game, though graphics where not impressive at all and you rarely fight with more than 1 enemy (which also lame) - so I don't see any reason why it should be slow.
Only 1 type of monsters... stick men.... boring... There are different kinds of weapons, but they are all pretty much the same. Just different colors, and slightly higher damage. Bosses were just disappointing (lame and weak)
I mean, if I gave Thing Thing 10, this doesn't deserve a high score.
I'm not saying it's worthless, but certainly overrated and not perfect at all - still needs lot's of polishing etc.