Dead-simple gameplay, retro 8-bit style graphics, nice grey-scale visuals, awesome music. There are no instructions (on the iPhone version), so the discovery o

Dead-simple gameplay, retro 8-bit style graphics, nice grey-scale visuals, awesome music. There are no instructions (on the iPhone version), so the discovery of how to play is also fun (helps that this phase doesn't last long, only one thing to figure out).