The ending screen deserves to be enshrined as one of the greatest pieces of art that has come out of these jams.
The game itself could use some improvements. I think it's serves as a good demonstration for why basically no modern shmup has your firepower increase by 100% for each level of power. Since the enemies don't grow more powerful throughout the stage, you end up being too weak in the beginning and too strong towards the end.
It's also not great that the stage is 100% aimed bullets. Until the boss arrives, you're basically not doing any real dodging and have little sense of where your hitbox is. The boss itself is fine though.
The game could have used a score counter or kill counter or something, for replay value and for people to compare their performance with each other. Still, the art alone makes it worth playing, not only the ending art but the sprites themselves are cute enough, especially the fairy death animation.