Blue Wish Resurrection is a vertical shooter by x.x that features two ships to choose from, three difficulty levels and five stages with obligatory end-level bosses.
There's an autobomb option in the config screen, and pressing space will bring you back to the main menu even when you're playing. The Heaven difficulty is probably too easy for most players, while Normal is the best one to start with. Health indicators are shown for large enemies to help you gauge the amount of damage they can take.