Dowhatnow?
26 artists. Sadly, each flash artist is trying to make their game the standout game, and expect you to know which control will do what. Save the happies is the worst case of this syndrome, because you have to know the controls and execute them without a second to lose, and along with that it requires skill. The take a photo game also expects you to already know what you're doing as well, which is a pity. Some games were simply too hard (like the one where you're in a circle with stars randomly flying at you), while others were made by people that fail to realise that the balanced difficulty level is what makes the game fun, rather than the winning (like mow the grass).
The instructions tell almost nothing of what actually to do (I still haven't a clue how to fill the damn balloon after at least four tries).
This would be at half the points if it weren't for some magical games in the sprawl; the avoid the lines game is cleanly drawn, requires skill, but is not so hard you will be struggling to do it. Sadly, I can only think of one other game that also hits the magic middle (the spaceship one).
What most of the artist here have failed to grasp is that their game must be beatable first try, while others have simly fallen off the other end.
All in all, quite a mess of a game. If you plan on doing a collab again, I would recommend mailing developers you think may want to contribute (and will do well) rather than allow anyone in and be forced to accept things on the borderline of fun en masse.