The casing he has built looks nice, but really all he has done is taken a commercially available laser and fitted a shiny case and battery pack.
I wouldn't get too stoked about "lazor gunz pew pew" quite yet, there are a LOT of issues with taking something like this, which is effective over a few inches, and turning it into something "useful" that works over longer distances. Most notable is the power requirement which goes up at a staggering rate as you try and increase the distance. Beam dispersion, ionisation of the atmosphere in the beam, energy dissipation, power sourcing, optical resilience and overall reliability all need to be worked on too (to name a few).
Right now the best attempt I have seen was a US Army project to intercept incoming missiles. The power source was the size of a semi-trailer and the laser was in a separate semi trailer "next door" iirc.