Good basis of gameplay, I enjoyed the inclusion of a special attack which becomes available after a cooldown time.
The sounds and music are both well selected, they fit the game and add to the immersion for the player.
The theme feels as though it was included for its own sake rather than fitting organically into the base gameplay. There are no objectives in the robot dimension other than to survive so that entire aspect feels more like a disruption of the gameplay loop than an addition to it.
The turrets are capable of destroying each other when firing at the player. I also think it would add greatly to the enjoyment of the game if the robots could be run over, they're quite difficult to hit due to their size but are impassable objects on their own.