The Best Mod Ever Made
You wake up in the middle of a weird space station with a strange looking gun in your hands. For some reason you don't see things through your eyes anymore but rather like if you were playing that game called Super Mario Bros only it's real. Your mission is to infiltrate this space station and find out what your mission is, and then send an angry letter to the mapper madman that sent you in this place.
To read the rest of the incredible The best mod ever story, either send 500€ to me, or get the Keen source code from ID Software.
As mentioned, TBMEM mostly focuses on large waves of enemies. The author plans to add some Keen 1-3 enemies into the fray as well on a future date to make the mod less repetitive.