The FIXED one

Killer of Hell: Have you ever wondered what would a retarded child of ULTRAKILL, Doom (1993), and Minecraft look like? Well, here it is!

Controls:
WASD for movement
shift to dash
space to jump
mouse to aim
click to shoot
R to respawn when you die.

Credits:
FredRichi - Free Characters with Animations for FPS Game
dill0511 - Over 25 16x16 Tiles
Rekkimaru - FPS Gun Sprites
DavidKBD - Eternity Djent/Metal-Scfi-Horror Music Pack Licence: CC By 4.0
vmgangsta7 - Doom-like Weapon (weapon sprite)
Limofeus - Pixel simulations
sire assets - Basic Gun Asset Pack
guilemus - UI BARS
Sweenus - Zombie Sound FX (Reverb Heavy)

Bugs:
The game sound kinda breaks when you finish the game. (a problem on my end but it's not that big of an issue since the game is supposed to end anyway)
Enemies can disappear.
The last boss doesn't have a boss theme (somehow forgot to code it in).

Link to the MixJam page

Link to the submitted Killer of Hell game