Recently I am playing Solasta, it has minor graphical issues, but this game shows real verticality. Flying creatures really fly. With square cell system, they implement spider walk too.

Larian has implemented flying as long jump since DOS series, but it would be more interesting, if flying is real.

Actually, there's no much system advancement from DOS 2, only changes to 5e rule. (New things are light system, and verticality). Why don't they categorize inflammable tile, and flammable one, make enemies notice hazard environment? (Like some weirdos place explosive barrels in front of them.)