WASD to Move Mouse to aim Left Mousebutton to shoot With the Start Button you can enter the arena in the sky. From wave to wave there will spawn more enemies but you will also get more money. With that new cash you can buy upgrades in the hub area. Level UP - Your planes looks different and you fire more projectiles at once Health UP - Increases your maximum healtpoints Speed UP - Increases your movement speed Firerate UP - Increases your rate of fire Damage UP - Currently not working Money UP - Increases the amount of Money you get from defeating enemies Can you get to the final boss in wave 5?