Space to fire. R to play a reload animation on some weapons. Use the slider in the top left corner to switch weapons. These vary in quality on how well I've timed everything. Most of these aren't as good as I remember.
Credit to whoever made smooth Doom for a fair amount of the sprites. Sounds are from Doom 64 and other random sources.Thanks to https://scratch.mit.edu/users/doomguy-2/ for telling me were to get the sprites for the pump action Super Shotgun (I completely botched the animation though, still need to fix that).