As someone who also made a game about counting, I'm a bit surprised at my lack of ability to keep a coherent count in this one. Constantly kept blowing myself up. It is a interesting concept though and I think with more feedback from shooting enemies (hit sounds, enemy reactions, particles, etc) it could be pretty satisfying.
Also could do something where maybe the closer you reload to 0 bullets, you get a buff or something for your next round of bullets? I don't know but I think there is a strong concept here that could go far. Good work on your game!