The "kids" at the end are Commander Keen (clones? or whatever), the star of the very first several games id Software produced before Wolfenstein 3D. So it's an easter egg with a very Doom-like twist.
If you've heard of the Dopefish (many, MANY easter eggs of the Dopefish throughout many First Person Shooters), but never played the Commander Keen games, that's where the Dopefish is originally from.
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