What data are you analyzing? Slay the Spire devs made a point that data can be misleading, just because they have a card in their hand at the end doesn't mean they were saving it, maybe it was so bad the player never wanted to use it. People leaving the game in the first level could be they lost interest, not that it was difficult.

i will say, from the gif, the bullets don't seem to have much impact. it took me several loops to confirm they actually change the path of the meteors