Defense Grid: The Awakening

A birds-eye-view real-time tower defense game. I spent an enjoyable 10 hours or so playing (poorly).

THE GOOD:

• Very intense, nail-biting gameplay!
• Surprisingly deep strategy derived from very simple principles (like the line of sight of guns, or the enemy path-finding around towers)
• There seem to be lots of special game modes, and extra non-story missions, for completionists (caveat: I didn't try any of them)

THE BAD:

• There's technically a story. I'm not sure it makes any sense. Attacking aliens need to march across your indestructible walkways, and get attacked by your indestructible guns, only to arrive at a convenient fueling station full of your precious power cores. Why didn't you cover the power cores with the same indestructible material you use for the guns and walkways?
• I found it difficult to come up with winning strategies because there is a large lag between making a strategic choice and seeing the result. Although, I could usually muddle my way through after a few retries.

THE UGLY:

• Nothing! I found no bugs or glitches in this game.