Metal Arms: Glitch in the System/The Zombiebot King

First boss battle.

Rocket Launcher ammo is behind your spawn. SPEW, Rivet, and Scatterblaster ammo are along the far wall.

The first grate on your left contains a Fleet Foot booster, which makes this boss a lot easier to manage.

After defeating the boss, Mozer gives you the level 2 rivet gun.