Use WAD or <^> to move. Use the mouse to aim and scroll to change between your weapons (if you have more than one to switch between). Press space when you're touching an item to pick it up. You can only hold 2 weapons at a time; a pistol and another weapon.
Thanks to @Yobo-Hobo for the name and some scripts. Project History: 8/23/19: Released demo version 8/26/19: Added bullet spread and a photo of when you stopped the project (including clones) 8/28/19: Fixed a bug where your weapons inventory would continue to show weapons you had before your death (You lose everything but your pistol at death) 8/29/19: Enemies now can do head-shot damage against you (Head-shots are double the damage against you) but your shots have a 1 in 7 chance of doing double damage. 9/14/19: Removed DEMO from the title, added a boss, fixed a few glitches, and also added 2 new weapons.