I'm not that good at bullet hell games, so this was tough :D
But what can I say, it's a simple arcadey bullet hell, with a nice retro theme. It is unclear to me if there's any other difference between the "letter" and "plane" modes aside from the other having a dash and the other being able to shoot? It seems you'd always want to stay on the plane mode.
It was also unclear if there was any progress between levels or if it was just the same.
Other than that it's a nice little game fit for the scope of a jam. :)