I think what this submission lacked in the modifier it made up for on the so bad its good side. The dubstep whenever you crouch, the non-animated enemies who float in the air when you die, horrid level design and draw distance are all great touches.
The two things that to me stand out as falling under the retro modifier are the low draw distance and the zooming out and spinning of the camera when you die, all you'd really need on top of that is for there to be a really echo-y death scream ala Metal Gear Solid. The sound effects for the jumping, walking and some enemy attacks were some nice little flourishes.
From a certain perspective I can certainly say that this game is the most immersive with the removal of any HUD or menu whatsoever.
Also I have to congratulate you for learning UE4 and blender for the first time, as someone who has used blender since they were in elementary it's always nice to see people pick it up for fun.
Overall, good job man!