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I'm pretty sure this is made using ImpactJS for anyone that is interested.

It's not. Retro first-person shooter, written in JavaScript using three.js.

for anyone interested, just look at the deps folder on the repo: https://github.com/timeinvariant/gorescript/tree/master/src/...

I think you've confused it with the (really cool, recently released) TwoPointFive plugin for Impact: http://phoboslab.org/twopointfive/