9/10
Wow. Sure, the graphics look like something out of the 90s, and there was only one weapon, but this had all the charm of a Serious Sam/ Doom/ Duke Nukem style fragfest without sacrificing any of the fun.
Some minor issues though:
- The rats. They were just too annoying and not at all fun to fight.
- The boss. He had way too much health considering how easy it was to kill him.
- Holding down fire constanly would stun and lock melee enemies in place, leaving them helpless. A bit cheap.
A possible feature for part 2 would be adding in an overheat bar for the chaingun that would take 2-3 seconds to completely empty, just enough to put some breaks in the constant fire.