the adventure/platformer game with a cardbox figure is definitely a very good idea! there could be danger zones for the character like fire and water, and wind could also have a great effect in case of a platformer. ideal for a cartoonish game for children.
Hmm ... well I fail to see the good idea here. It certainly is a nice and stylish character but just that doesn't make it a good game (idea). Not that there exist no opportunities but calling a character concept a great game idea is not what I would have expected here...
Apart from that:
http://www.youtube.com/watch?feature=player_embedded&v=owhNydizKB8 
