It's just more DonPachi, so it's good (but also kind of just feels like DLC bonus content). Shoot down all those helicopters and tanks, and dodge hundreds of bullets with each passing second. DonDonPachi is considered a formative shooter (or shmup) for the "bullet hell" subgenre, and as such is an interesting title to go back to (along with its predecessor DonPachi) to see some of the beginnings of screen-filling bullet patterns, forcing you to constantly "plan ahead" your plane's movements on the spot to weave through the extraordinary number of enemy projectiles. Luckily the PS1 version I played (on my Vita) includes the ability to slow things down, which is nice for chumps at shmups like myself. There's git gud games, and then there's games like DonDonPachi... and then there's this mad lad, who completed a 1CC (one coin clear) of the game with the Xbox 360 Kinect:

http://www.nicovideo.jp/watch/sm18619836