Never thought I'd play a yahtzee FPS before, interesting idea! I liked the idea of having to multitask, juggling paying attention to enemies and the dice that you're rolling. There doesn't seem to be anything preventing me from just spending time trying to get the perfect rolls though so the gameplay devolved more into like a test of patience than a coherent strategy or skill/luck based shooter.
One fix to this might be having the player take damage every time they roll dice, and having them get all of their health back when they fill in a slot on the score card. It would kinda emulate the 3 roll limit that yahtzee has, but with a fun FPS twist, and allows for some risk-reward behavior. Might be cool, IDK!
Good work!