[SUBMISSION] Painkiller Shotgun

Info:
Name: Painkiller Shotgun
Class: Level 3
Type: Hitscan, projectile
Palette: Doom
Summon: PKShotgun
Ammotype: shell, cell
AltFire: yes

Credits:
Submitted: Doomperson 999, lolo_is_cool
Decorate: Doomperson 999, lolo_is_cool
Sprites: lolo_is_cool
Sounds: DreamCatcher
Idea Base: Shotgun from the game Painkiller.

Coooool! Core memory unlocked! I'll check this out tonight!

The fire rate and kickback are insane compared to the original Painkiller shotgun.
The ice shot should use a different ammo type, as it deals a lot of damage to use so little cell ammo.

If you don't have Painkiller, then watch a weapon showcase on youtube, or check the mod Painslayer, so you get an idea on how it works.
https://forum.zdoom.org/viewtopic.php?t=72567

Also, please learn to organize your files with folders:

I can fix everything else, but the last issue is something that has been bugging me for a while now. I don't know how to make folders inside such files.

The option to create folders doesn't appear in your files because your method of converting wads to pk3 is wrong.
To create a pk3 file in Slade3, first select the "create new file" tool:

Then choose the "Zip archive" type:

And then you'll see the option to create folders:

At the end, don't forget to save your file as a pk3:

Added