Fortis is a classic-style shooter in a 3D environment. 36 levels with different backgrounds, enemies, and bonus stages. The enemies have different weapons, strengths and resistances, and they can even consolidate themselves into bigger ships!
The player has 4 weapons to choose from: cannon, plasma, rocket and fireball. The cannon is the weakest weapon, but it's only one with unlimited ammunition. Collect upgrades, points, and money to buy upgrades and ammunition.