Check the Steam page or the developer's website; indie shooters often provide a free demo which allows you to experience the core mechanics (the "Vortex" combat) without security risks.
Hundreds of levels that evolve as you play, including massive boss fights and a "Vortex" mechanic that influences ship movement and combat. vortex-attack-ex-pc-game-free-download-full-version
As a title from a small developer, the "full version" is priced modestly (typically around $10 USD). Purchasing it directly ensures the developers can continue creating updates and new projects. How to Get the Game Safely Check the Steam page or the developer's website;