I'll start with a short piece, I do on all the unity games with no web build. Do web builds. More people play web builds than downloaded versions. My first game with a web build was played more in it's first two days, than all my games without it in all the time together!
Now- the game :)
Firstly- pretty impressive models and use of post processing! Glowy eyes added to the atmosphere.
As for audio- it needs work. I think the gun only makes a sound if the bullet hits an enemy (or is it the sound of enemy getting hit and not the gun?).
Use of the theme was actually pretty cool! Not only the glasses serve an actual purpose, but instead of the street, you have a cyber street, which is a nice take on it! I sorta wish the cyber street looked less like a bunch of floating platforms, but floating platforms serve as enemy delivery system, so I guess it's ok.
Now the gameplay. It was nice, but I feel that with some polish, and a bit more time it would've become really great!
First- i already mentioned no gun noise, but it ties together to what I'd call little gun feedback. I went through two platforms before I discovered that the gun could be fired way faster than I thought! Firing the gun fast was more fun, but I wish game showed me that I could to that :)
The tutorial level doesn't teach you how to jump, so I was confused for a moment after calling in the first platform (the tutorial clip that plays on the TV is brilliant though).
I'm not sure if the two enemy types differed in something other than looks, and health, but it's good you had more than one type.
And lastly- the portal. I waited for a second for something to come out from there. I'll be honest- I counted on a boss fight :)