Gunio is a side scrolling 2D-platformer akin to Super Mario Bros. You control a gun wielding character and try to get to the end of the level with the highest possible score. The map and enemies will be predetermined. The enemies will primarily be stationary turrets stationed in a varying amount and at different height levels.
The players aims to get to the end of the level with the highest score possible while avoiding and/or killing enemies along the map. The score is determined by the time taken to reach the end of the level, the amount of killed enemies and how many times your weapon was shot. The player has finite amount of HP and if killed will it restart the level.