Very polished! I think I definitely would have wanted some more control over how the fights played out, like giving a character a buff or something. Still, it's an easy to grasp concept with good execution!
Nice game, I was getting worried that the game would become too long/difficult but it was the perfect length. Was slightly confused about the leaderboard scoring system though. Would be more clear if it was time-based.
Fun game! Your Godot scaling mode should probably be canvas_item and expand so that the game looks right on bigger screens.