I love the artstyle, it was super charming!
The character sprite and animation is super well done! I love the concept of Sofia spinning as she shoots bullets around her.
Adding a feedback when you hit an enemy could improve the feeling of impact (a few tricks like scaling/downscaling the sprite quickly, flashing white on impact or changing color quickly, screen shake, etc). That would help! The same apply to when the player gets hit.
Like others said, a health bar would help too!
Also, for bullet-hells, you want the hitbox of the player to be very clear since the screen fills with bullets. I wasn't sure which part of my character was the hitbox (the torso I think? because the head wasn't getting hit). Many incorporate the hitbox visually in the sprite for their characters to let the player know where it is! Just to keep in mind for this kind of game :) Food for thoughts!
Good submission overall, great job!