I realize that I'm probably going to be eaten alive, but please, instead of just saying that it sucks, explain why it sucks, and/or how it could be improved. Thank you.
I wanted to get away from the Half-Life 2 logo while maintaining the 'building blocks' element. At the same time, I wanted to simplify it to make it look better at low resolutions, and add in a little color. The result:
And also, a wee 16-pixel version for the thumbnail in Steam:
Again, please give your responses some content so that I can improve this. I just came up with it off the top of my head; it's not intended to be refined yet.