Well, I guess I'm good at bullet hells as I didn't die in my first run.
That said, in my further playthroughs, I had some crappy RNG where an enemy with a sword spawned directly on top of myself, forcing unavoidable damage.
As a final note, i think it's a odd choice to incentivize the players to kill themselves in game. A strategy could simply be to die ten times, pick out everything you want, and then breeze through the game with no effort.
The hitbox felt a little large? Either that or it was a square- which given how the player is a circle, I would hope the hitbox matches. Typically, in a bullet hell you want the hitbox to be 'misleadingly small' so it benefits the player without them knowing. It feels better than getting hit when you don't think you should've been.
Nice game!