thanks for your comment, we didn't make the power-ups have more impact on the player because of the time that we have, and was the first time the artist doing pixel art. The left and right collectibles change the eyes of the skeleton, the jump collectible is the one that changes the fire color, we had the idea of making him legless when he couldn't walk and we are struggling to represent the jump ability, that is why we choose to change his fire color.