Dropship
Originally available for sale on the iPhone store, Ngmoco has finally changed their minds and made Dropship available as a free download. Praised by many as "one of the best shooter games" on the device; it's certainly won its fair share of fans.
The game allows you to test your skills as a dropship captain; ferrying human passengers using tractor beams. Graphics feature a colorful Tron-esque world of blocks and beams.
This is the fourth game from the developers and it seems that they definitely got it down to pat. It's an excellent game that's certainly worth checking out. Grab the download and start playing!