My super-annoying technical issues aside, DARIUSBURST SP is still a very good-looking and well-made shmup. Whether or not it's worth the $10.99 will depend on the individual and their love of shooting space crustaceans, but it's certainly a solid effort.
Dariusburst SP is an excellent shooter, packed with three different game modes, alternate routes and endings, great graphics and music. What a pity the touch controls don't let you cover the entire screen with a single slide.
Considering this is essentially a remix of a three year old PSP and arcade game I would have expected this game to be priced lower. Having said that, you get what you pay for, and even at a higher price I would argue that it's worth every penny.