Gara's Mass Vitrify wall is too thin.

[Kotanaru]

TL;DR: Wall too thin, enemies clipping weapons through and shooting inward.

First off, the ability is stated to block enemy fire.

The issue: enemies are walking right up to the wall and clipping their weapons through, enabling them to bypass the wall and shoot within the area.

Evidence:  
A Shield Lancer firing through the wall with his Viper.
An Ancient clipping its hook arm through the wall.
A Bombard firing through the wall.

Possible solution: Make the wall hitbox thicker. The model of the wall does not necessarily need to scale with the hitbox, if desired in order to maintain a thin glass appearance.

Additional issues:  
The wall uses bad materials and in many tilesets, the lighting causes it to become blinding.
Small spoiler for those who have not built the personal quarters:

This image is taken without bloom, and the exact same colour scheme is used in this image as with the Shield Lancer image.  

Bombard and Napalm explosions bypass the wall.

Edited February 12, 2018 by Kotanaru
Turned Imgur links into actual photos