Interesting concept and art. I liked the idea of having to switch characters, but like others have commented, being Em needs a bit more incentive other than just charging up Warrior. Also, thank you for the instructions below the game, as I did not catch that I had to hold the x button for 3 seconds at first (three seconds is a long time). Also, the way the text came up in the tree, it was a bit hard to read.
Overall I liked the concept very much and can see a game where the interplay between characters is more vital to how you move through the world.