Not bad, needs some polish though.
I'm glad the actual game mechanics worked out smoothly. The jumping felt solid (Which you don't see much these days) and the characters moved at the perfect speed (Not too fast, not too slow).
This is almost like a simpler version of umm.. what's game that started with 'L' with the little green guys. Well anyway, the individual characters you control had specific powers. In your game, the individual characters don't have special abilities. Though that simplicity doesn't make your game any less enjoyable.
The best part is the fact that the puzzles are intuitive and deceptively simple. The triggers that require more than one person to activate is a brilliant spin to add more challenge to a otherwise simple gaming experience. And the puzzle aren't impossibly difficult or yawn easy.
However, this game needs a restart button or better yet suicide button (And then the characters respawn), because on the first ice level (I had 6 characters at this point) I got to a point where I had gotten one of my characters stuck and I needed him for a trigger. So i couldn't continue.
Other than that, it was a good game.