In the video above, 24 Caret Games' Matt Gilgenbach offers some insightful commentary over five minutes' worth of new gameplay footage from the upcoming rhythmic shoot-'em-up Retro/Grade.

In development for over three years, Retro/Grade won the Audience Choice Award at IndieCade 2010, and was recently featured at PAX East's Indie Megabooth.

Retro/Grade's reversed, low-scoring gameplay is optimized for Guitar Hero and Rock Band guitar peripherals, though standard controllers are also supported. The difficulty level gets pretty wild later on in the video -- try to keep up!

Retro/Grade is set to launch this summer as a downloadable title for the PlayStation 3.

[via @mommysbestgames]