Thanks for the detailed feedback! You can disable screen flashing from the settings though i guess i should have probably mentioned that or maybe had it disabled as default!
The gun fires every 2~ seconds and checks your beat combo adjusting bullets to that, but yeah i can see expansion on this.
(also i wrote my own beat detector i suggest you look at the source code of rhythmnotifier to understand it if ya want as its not that complicated as it seems godot helps a lot as it simplifies the complicated parts.)