I know that screen space filters are heavy for mobile platform, but was wondering if it’s possible somehow to have this, even at quite low resolution.
I am developing a racing game, it’s fast, so a low resolution filter wouldn’t be noticed much, and it would add a huge visual impact.
Gloom happens just by using Unity… 
Bloom on the other hand, needs you to use a post processing filter 
The effect itself is really simple, but it may add a lot of overhead if you’re using 0 other post processing, but if you think it will add a lot to the game it may be worth it.