Until late alpha, power-ups could not be picked up if the player had a completely filled amount of the type of power-up. For instance, if the player had completely full Health, hearts could not be picked up. Additionally, the hearts and shields were not 2D images, but rendered 3D models that slowly rotated.
For a short time in the beta, a glowing feather power-up was also in the game. When picked up it would give a speed boost similar to the Quicksicle.