Hey, I am glad you liked my game
Actually every character had different power. Now I regret that I didn't make some kind of tutorial.
So,
I made a system of "souls". You get one soul killing each enemy (bar at the bottom of the screen shows how much you have). Like I said, each character has individual power (wchich you can use, while pressing "r" button on keyboard):
Morbius: Regeneration power
Hermes: Faster movement speed and jump power
Hades: Ability to become invisible
Palladin: Activates shield, wchich reduces damage
Of course every use of power is temporary (every lasts 7 seconds).
Ok, I think that's all, thanks for your feedback.