Developer Sean McCracken 'almost done' on Psyclops, the first shoot 'em up for Google's augmented-reality eyewear

Google ended up adopting "OK Glass" as the activation command for its Glass eyewear rather than "Pew Pew Pew", but the sound of laser guns may yet ring out from early adopters of the device.

Developer Sean McCracken has revealed details of his first game made for Glass. It's called Psyclops, and according to a post on his Google+ profile is "almost done" and will be "like a 3D Space Invaders mixed with Missile Command".

McCracken was one of the winners in Google's If I Had Glass contest to get early access to the device, and has been working on the game since receiving his Glass in late July.

After posting an Instagram video of the game last week, McCracken has since published a better-quality video on YouTube showing Psyclops running on a Kindle Fire tablet, to make it clearer what players will see on their Glass' screen:

Google has been encouraging developers to start building Glass apps using Android tools, rather than wait for the release of its official Glass Development Kit (GDK) to help.

"We're still hard at work on the GDK, but in the meantime, you can start designing and developing your awesome ideas with the existing Android SDK," explained Google in July.

"Although you won't have all the tools necessary to design the perfect experience for Glass, developing with the Android SDK (API Level 15) lets you try out ideas while you wait for the GDK."

McCracken is one of a number of developers building games for Glass. Other examples include location-based strategy game Swarm! (whose developers appear to have coined the term Massively Multiplayer Online Augmented Reality Simulation); and Battleships-style game GlassBattle.