Huh?!
I seriously didn't get this. You had this GREAT concept of switching characters and each being able to use different abilities. It's been done before but not specifically like this - and it's definitely a cool idea. In addition you had some nice graphics to boot, which just puzzled me all the more, why weren't you using any of this elements? Instead of having different scenarios\enemies which would react only to specific characters\abilities you could basically pass the whole thing with one character.
Which just made the whole character switch option more annoying than anything else, especially considering it was a lot easier with some character's than others. Ridiculously easy, I should add.
As others have stated before me, adding ammunition or a usage time bar to each characters abilities might help. Instead of having an infinite amount of ammo or molotovs these come up as powerups every once in a while, and nene's shield might decrease power...
Also, as I've already stated, why not have certain enemies vulnerable only to one specific weapon? That way if you're out of ammo you'll HAVE to switch characters and\or simply dodge.
It really is a shame that a potentially great idea like this had so little game-play value. So thanks for the game anyway, and hope to see more from you guys soon!