Yeah, sure! Ok, first, I think that a good improvement would be to shot a bullet whenever the player finishes to type the letters, because is kinda weird that you shoot 5 bullets and each one of them is a miss and only the 6th one kills the enemy :D. Another thing that is pretty weird is if you shoot with only one player but miss some letters and you don't shoot with the other player at all. Then the player who didn't shoot wins. I guess in that case it would be more intuitive that the result would be a draw, and also some kind of time pressure would be good to avoid haing endless matches :).
And another advice would be to work work work. Play a lot of games and analyze them, see in which way they are good or bad, get a lot of inspiration. Also, a good idea would be to browse itch.io and review games.
And also, focus on giving the player a lot of feedback, visual or audio. Help the player understand the game. What resource I can recommend to you is Mark Brown's Youtube channel, He talks a lot about game theory.