https://youtu.be/YBobCQLg_Yk
haha

When i need a break from Blood Moon I'm going to make a small project. A rail shooter where you need to rush through hordes of monsters following only 1 path solving puzzles along the way against time as the path behind you will become a "danger zone" killing you if you're not advancing fast enough.
while using all sorts of crazy weaponry like this minigun. Just 5 minutes of crazy fun.
A prebuilt custom party with a minigunner, a shotgunner, a sniper and a grenadier. Or maybe even introduce multiple classes for different group setups, like a medic.
Or even better an endurance arena like Smash TV with enemies comming from all directions in rounds or endless waves until you die using clever reload mechanics and running around (mostly backwards) making sure you're not getting cornered.
The solid gameplay will primarily revolve around reload mechanics and making sure not getting cornered while traversing the arena. For example a minigun that fires 100 bullets for a duration, but then takes like 8 seconds to reload. A marine with a pump action shotgun which can be fired every second and deals massive damage to the monster in front of you, but you will have to reload it after a while. tactical gas and fire grenades.
Each wave gets progressively harder with more and stronger monsters. Arena gets harder with pitfalls and eventually lava pits maybe.
And an upgrade system where you can upgrade 1 weapon or armor piece after each wave.
Basically a 1 map mod.
Should be easy to build in a relative short amount of time.
EDIT:
Okay! I just went ahead and made a Proof of concept in just under an hour. Just 4 miniguns, instead of multiple sort of guns and a very tiny area, but you should get the point what I'm going for. Add random Doom soundtrack and rip 'n tear.
https://youtu.be/7Kw3mHM7o0Y