HTML, CSS and Javascript.
Credits for this game...
Music: Euphoric Atmosphere by MedalManiac
http://www.newgrounds.com/audio/listen/554460
Artwork was created with Blender and Photoshop.
Thanks to tutor4u for some awesome Blender tutorials.
http://www.youtube.com/user/tutor4u
Thanks to Archive3D for some models and ideas.
http://archive3d.net/
Thanks to http://www.soundjay.com for some of the sound effects.
A further explanation of this game can be found in the previous post at...
http://html5.litten.com/an-html-game-using-only-web-standards/