Really good use of the theme!  Needing to burn the score you start with to even start getting kills adds a lot of tension to the opening of the game.  And, I honestly really like that the pistol's fire rate is uncapped, summoning my cookie clicker skills let me use my recoil to keep distance AND manage crowd control surprisingly well!  I'd love to see some more granular texture with waves added, and some interesting and expensive ways to burn score once you've got enough for a decent weapon.  

cool game!