Love it
I really like these kind of games and this is no exception.
The rage bar was a nice touch and the boss wasn't impossible to beat.
You should add medals to this game and there could be some ideas.
1. something involving killing a number of type of enemy or a number to kill.
2. number of nuns returned to ship with out getting hit.
3. overall number of nuns returned to ship.
4. defeating the boss
5. reach a target score.
6. finally maybe get a game over.
Think about it