Big fan of this game!
Is there a bug with the bullets fired by spinners? They appear to orbit around a moving central point, making them very hard to avoid, especially when there are multiples. If there are a lot of them on the screen, it's basically a run finisher unless you have Bre.
Three wish list items:
First, make the player's burning bullets more visually distinct from red/orange enemy bullets.
Second, let all enemy bullets damage other enemies. It's fun and satisfying when you can blow up a bomber and lead a crowd of chasers through the shrapnel. More friendly fire would open up more similar tactics.
Third, it would be cool if there was a death screen showing your final level, gun stats, number of enemies killed etc.
Super fun and addictive game.