Retro revival studio DotEmu has just sent word that they have kicked off a 48-hour sale on five of their iPhone titles. From today until the 28th the following titles will be available for just $0.99.

64th Street � $1.99 ?�$0.99

64th Street: A Detective Story is a Double Dragon-style beat 'em up arcade fighter that was originally released back in 1991. The iOS version of�64th Street is wrapped in an emulator, providing the original graphics and an authentic game experience as compared to the arcade release, but with customizations that make it appropriate for the iOS platform.

Avenging Spirit � $2.99 ?�$0.99

During a walk with his girlfriend, a boy is ambushed by agents of a mysterious crime organization and is shot to death. Now, as a wandering spirit with the ability to possess most others, he is summoned by his girlfriend's father to save her from these criminals

The game is a run-and-jump platformer that sets itself apart due to its "possess anyone" mechanic. You start out as a Casper-cute ghost and make your initial possession. Then, when you die, your ghost pops out and you can take control of most any character onscreen. Your fighting abilities depend upon who you've possessed, so it mixes the game up nicely.

Earth Defense Force � $1.99 ?�$0.99

Earth Defense Force is a�classic horizontal shoot 'em up that made an appearance in both arcades and on the SNES in the early 90's.

The alien Azyma Empire, threatens to destroy the Earth with the Orbital Buster, a large computerized space satellite. The Earth's only hope lies in the recently developed XA-1 spaceships held under the organization known as E.D.F: Earth Defense Force. You are the pilot in command!

This iOS version features two game modes: Arcade and Freeplay, and also boasts support for both D-pad and touch controls. Online leaderboards are also a part of the package, as well as Game Center integration.

Golvellius � $1.99 ?�$0.99

Golvellius: Valley of Doom is a 1987 RPG that was originally released for the Japanese MSX home computer system and later brought to the Sega Master System.

The iPhone version of the game was ported by�DotEmu with iPhone UI modifications as well as an intelligent save system.

Nicky Boom 2 � $2.99 ?�$0.99

Nicky Boom 2 is a retro platform game that combines adventure, puzzle and 90's graphics.

A significant snag has hit the development of Dream:scape, the promising Unreal Engine-powered adventure game that's been making waves with those of us who like our visuals crisp and our worlds open. According to the game's creator, the title flat-out won't operate on third-generation devices or even the original iPad � but there's still hope it will be able to.

"So I have finally, after dozens of painstaking hours, accepted that my game, dream:scape, will never run on the iPad 1, iPod Touch, or iPhone 3GS," he wrote on the official UDK message board. A vicious memory bug, which makes the game crash when a build-up occurs, is to blame.

At the time of writing, "kamequazi" wasn't sure if he could just release the title for the iPhone 4 and iPad 2. It was an obvious point of concern in the post, as it sounds like the title is currently worming its way through the Apple review process.

The good news here is that, yeah, you can submit a targeted game. "I did get the go-ahead from Apple to release the targeted version," he wrote in an update. He followed up, adding, "Ironically, however, I did connect with a programmer who feels confident that we can get D:S running on all relevant devices."

"So, while he works on that, I am adding a few new gameplay elements. There will be a new trailer in the next week or so, and when D:S finally does get released it will be better than ever."

Who knew awesomeness could come from such a bummer moment?