Wings of Bluestar (UP)

This is by no means a hard shmup, and you only need to clear the first 3 stages, but you can make things even easier by going into the gameplay options and changing the difficulty to "Easy", credits to "All", and if you want to give your thumb a rest, you can put the autofire to "On".

Play through the levels, shooting everything you can, and this will pop after the first boss has been defeated.