Ultratron is a 2D top-down twin-stick shooter set in the fictional universe and inspired by Robotron: 2084 — an arcade video game about robots.
The player controls a robot and explores the locations as he pleases — there is no forcing to go further or backward. Traditionally, the left stick accounts for aiming and the right sticks sets the direction of fire. Not only the robot can utilize the firearms, but the explosives alongside with other throwables are available. The customization takes place between the levels — upgrades may be found on the battlefield and present themselves as score points which may develop one of the robot's characteristics: shields, smart bombs, droid power or so.
There are forty levels in total, with every fifth being the assault one — the foes are more aggressive and unwelcoming there, and every tenth is a boss level. The goal of every level is to eliminate all the enemies and get to the end of the location. The title sometimes features the bullet hell elements — there are so many enemies on-screen, they start forming a distinct pattern recognizable as a picture.
The setting is near post-apocalyptic future, where the brains were taken out of the humans and implanted into the war robots, who fight their way to the humans left to defend them from their dreadful fate.