Feels great! The special projectiles causing the arena to be built up is really cool. Also great asthetic. I think the bullet hitboxes could be a tiny bit smaller but that's just a personal preference.
The bullets are intentionally somewhat larger than typical bullet hell games because the gameplay doesn't really cater to high precision playstyle (think Touhou).
Nevertheless, point taken! Maybe if I work on the game further on, I could switch up bullet sizes!