How to make flat fire fx

I’m trying to replicated a stylized fire FX for a game I’m making and I’m having quite a bit of trouble with achieving the effect I desire. Here is the fire FX I’m trying to replicated

My current attempt at the fire is rough, gross and doesn’t even come close, the edge are foamy, not circular, and the color and texture of the fire is all wrong. How can I achieve this effect. Cheers!