It's a nice game...
It's a very nice game, I really like most aspects. But it's not without its problems.
The art is very well-drawn. The music is catchy. The character-design is good as well.
But it all lacked a certain charm. I missed the originality and charm that most characters from good games have. The leading character (and its multiple versions) lack a certain charm that a leading character really needs; just look at characters like Nintendo's Mario for example.
The gameplay, though amusing, wore off a bit too soon for my taste as well. The whole shifting thing is clever and fun, but it got a bit too taxing after a while.
Now I'm not trying to say you've made a terrible game, on the contrary, it's amusing! But I feel that with a more original and clever look, it could have been so much more.
I hope this criticism may help you all.
Good job on the game! I look forward to seeing more from you guys!