Billed as a strategic vertical shooter, the game "Advance! Protect it! Fight" is a Japanese game (surprise, surprise) that is coming to their PSN store soon, but you can download the demo directly from the game's site, and give it a go.
From the look of it, you check out the level, build your defences and then fight off the enemies. At the moment, there's a file error on the demo link. Not sure if this is just because its not up yet, or has gone down for an update. Will keep stabbing F5 and see what gives.