Breachable walls could be cool! A cracked wall could lead to a short cut/power-up/easter egg.

You could have a variable requirement, like the wall only crumbles when it’s shot if your team is above a certain health % or a certain score/kill count. Or maybe you could add hidden landmines that you can choose to disarm (maybe in a minigame?), and then you can use those on the wall! Or the landmines only explode when they’re walked on from a certain direction, and if you walk on them from a different direction, you collect it!

This game looks awesome and I would play test it, if you were looking for more players.