Good game. Real heart. I know making those assets is hard but once you set up the concept and the code, making more assets is just more game and more use for your talents that you can get credit for without a lot of the overhead planning. Writing is rough around the edges, but heart and gameplay is golden. Good visual assets, audio is perfunctory but very functional (even nostalgic).
A friendly suggestion: rather than a textbox saying "they're dead, you can put away the gun now" or the like after every duel resolution, have a textbox the first time only and pair it with an audiovisual cue like shaking, hard breathing, looking at bloody hands, and/or blurred vision. From then on, the audiovisual cue will be enough, loading up game cues with meaning and stripping away the textboxes to the protagonist's voice and the story you want to tell with words rather than mechanical cues and gameplay housekeeping. You can even progress the severity of the cues to express the progression of the character in various directions and depths.
Good work, I'm sure your grandfather would have felt good to see you flourishing in the world with this game.