Thank you for your review! I'm sorry to hear you didn't notice difference. You get more fire damage, speed, hp, larger view area, secondary aoe fire mode at some point.
aaaaah ok XD maybe some animations or something that changes on the charachter (like the color to make it more red or angrier) could have helped notice the difference!
Actually the fire in the head is growing and gain more view distance around you and 3 times get more bloom effect, but there is 12 form, so I had to split out the differences, cause it's too much at the end. But I understand, some more directed indication needed.