I'm almost 30 and I have no shame to be playing this. The first time I played Doom was on the SNES port and even though it looked hideous it hooked me up real hard and I gotta say... this is amazing.
The writing is sensible and cute, the characters have a lot of charm and it's quite endearing with all the remarks the characters do to the enviroments of Mars and Hell. This is a great work.
Besides using Doom characters, this is the kind of stuff that could easily gain traction with completely original characters and references to retro shooters. Love this.