Thanks! The fire effect I did with the the particle system in unity + the Pixel Perfetc Cam, the rocks and props I don't remember the asset name now but I think it is credited in the credits panel in the main menu
I did something similar to that video How To Make Fire Particles System in Unity and use similar settings and darker color to make the smoke on the back. You can also try this one Unity VFX Tutorials - 08 - Basics (Fire) (youtube.com)