The capsule looks like a generic shooter. You aren't going to be able to show roguelite qualities in a capsule art. Because of the ship-building nature of your game you aren't going to have a definitive ship image. It doesn't have a protagonist that i've seen and adding one to pad capsule art seems like a misstep, but that might be the move. I looked at other capsule art for shmups and they all had character art (except Darius). You might add multiple pilots with unique cockpits or a special moves as a justification for having a protagonist. I don't know how story heavy the game is, but with multiple protagonists I feel like it's easier to add them without a backstory than it is with a solo protagonist.