left and right arrow keys to rotate. forward arrow key to move. space to shoot. Every 15 seconds, the game gets harder. Every 15 seconds, you can press b for arrow barrage, which lasts for a short time. Every 20 seconds, you can summon a mercenary. They last for 60 seconds. 30 seconds into the game, you get an armor and arrow upgrade. Also 30 seconds into the game, it gets harder. You'll see. If you last that long.
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