first, prepare about 2 hours of your life to get wasted by a videogame. Use WASD to move, click to fire, and mouse to aim. if you have shield, then it takes most of the damage, but if you still have shield left and your health gets to 0 then you will still die, kinda like Fortnite.
credit to Gorgon07 for original project. he made it a bit easy so i did a little and now its a lot harder, but still possible.