First of all, very cool game, very creative concept
I love the art, I like the animations when switching between the characters, I like the levels, and it's impressive that you did this by yourself
If you plan on continuing this, I may have found two bugs which might be a bit clunky
1. After dying, when you switch to another character, that character still appears in the scene
2. When switching from princess/hero to dragon, the princess doesn't do anything and I can pass her, but when I switch back to one of the other, the enemy can strike me from a distance which