This is probably your best map so far. I like the looks, bg isn't too confusing, but be careful with it in future, when bg makes bad for gameplay, it's worth deleting. Theme works nicely, maybe it makes me interested to make toxic map too in future.
The flag throw works nicely, with luck you can throw the flag base to base -- > FUN. Also there is possibility to boost flag by throwing flags in center to behind flag --> flag boosts and player gets it.
The issue in gameplay are collider walls, if you think about using them, don't use them, if you still think about it, try something different and don't use only bullet collide polygons either!