How to beat The Twins in Atomic Heart

First and foremost, concentrate your firepower on one of the Twins. The one on the ground is simpler to target and can be hampered by Shok, allowing for Fat Boy Missiles or successive shotgun blasts. Even though it may not appear to be so, both Twins share a health pool; wounding one will result in it eventually drawing health from its counterpart. After the battle, it is only necessary to defeat one of them to emerge victorious, although both will be defeated by the end. 

During the fight, the Twins store energy to unleash powerful Polymer assaults. The airborne robot will call forth flaming Polymer balls that either explode on the ground to make a hazardous pathway or roll towards you, knocking you down for the other robot to strike. It is easy to avoid the large rolling Polymer balls but make sure to keep away from the smaller blobs of Polymer. The Twins also utilize energy blasts and ionic beams that can be tricky to dodge. Staying out of the Twins’ sights is the key to survival and the best way to combat their attacks.

When you find yourself in a tight spot, don't forget to use the environment. You can use the shield generators on the ground to block their attacks, and the surrounding walls of the arena can be used as cover. The Twins can also be damaged by the various obstacles scattered around the arena. Use the environment to your advantage to gain an upper hand on the Twins.