Gun Strike is a shoot em up game where you control the sights of various weapons and defeat enemies.
Gameplay in Gun Strike is very similar to other games like Overkill where you are in a static position controlling the sights of different guns. The gun is actually an overlay to a sight that does not correspond to an actual real gun though.
Aiming is inaccurate and most of the time, you will be firing on full auto to kill enemies. The graphics of the levels in Gun Strike are actually interesting because they are 3D polygons and enemies have animation. Different enemy types keep things varied, but the game does get repetitive very quickly.
If you like simple shooting games, Gun Strike is one of the best examples.