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You can control the elf using either a Keyboard, or a controller.

With a Keyboard, you can move with WASD, and the Arrow Keys. The Space key will allow you to quickly restart a Single Player game on death, and Escape will bring you back to the main menu

With a Controller, the movement is done with the left joystick, and the reload is done with A.

To play in a local multiplayer game, it is best to play with one player with a keyboard, and the other one with a controller.  The controller player will need to press the A key to join the game and be able to move