Gravitron 2

Gravitron 2 is a retro styled arcade gravity shooter in which you must pilot your way through some of the most devious terrains ever devised.

                <p>Key Features:</p>    
                <ul>    
                <li>40+ stages packed full of enemies and traps</li>    
                <li>3D sound in a 2D enviroment</li>    
                <li>Online highscores</li>    
                <li>Configurable controls</li>    
                <li>Stylized neon vector graphics</li>    
                <li>Bucket load full of particle effects</li>    
                <li>Dramatic musical scores</li>    
                <li>10 Achievement awards (Steam version exclusive)</li>    </ul>

Source: Steam Store Description