I don't understand the premise and i don't know why i become a baby everytime i go in slowmotion but overall shooting feels great, realistic sound design add a sense of punch to all weapon and the slowed sound effect are similar to contra III and it give me a nostalgic tear. The explosion sounds in 8bit were pretty disappointing you should separate realistic sound for combat and 8bit sound for everything else.
Also you should give more brighter colors at the location, not just for the empty atmosphere but also for better navigation, most of the time i couldn't see the difference between walls and floor.