O desktop browsers use WASD or ARROW keys to move, 'X' of Shift key to lauch missile. Use the mouse to select levels or select which part of your ship to buy i hagar.
O mobile browsers there are two optios to move the player's ship which you ca choose i the settigs meu.
The default is by usig a virtual joystick like may arcade games ad the other is to move the ship usig your thumb. You ca lauch the missiles usig the touch butto o the right

The player controls the ship, shooting laser to enemies, launching homing missiles and fighting bosses.
Each level the enemies differ, more difficult enemies are added and more difficult bosses. Each boss moves on its own unique pattern.
Collect power ups like health, missiles, and bomb that kills every visible enemy to clear the stage.
Fight through 16 ready levels.
Collect the parts from the exploded enemy ships.
Use the collected scrap as a currency to upgrade your own ship.