I am so glad I checked the comments and found the bullet hell easter egg! For the people struggling with it, here's my tactic: (Disclaimer! It's not really hard but I'm an impatient person so I understand)
First kill the middle lady. She shoots twice as many bullets
Second kill the far right lady
Third kill the second woman on the right side
Fouth kill the far left lady
Fifth, kill the last one
That's how I did it after figuring out the patterns and what's easiest to dodge for me! Hope I helped!
This game was a fun experience, thanks for making it!